{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-26131", "tracking": { "current_release_date": "2026-04-01T23:27:40.785961Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-26131", "initial_release_date": "2026-03-10T09:17:09.302414Z", "revision_history": [ { "date": "2026-03-10T09:17:09.302414Z", "number": "1", "summary": "NCSC Score created." }, { "date": "2026-03-10T17:40:53.726510Z", "number": "2", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-10T17:41:04.791245Z", "number": "3", "summary": "NCSC Score updated." }, { "date": "2026-03-10T18:21:40.693385Z", "number": "4", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Product Identifiers created (1).| Product Threats created (2).| Product Remediations created (1).| CWES updated (1).| Exploitable created." }, { "date": "2026-03-10T18:35:14.507365Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-10T18:36:07.982242Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)| News created (1)." }, { "date": "2026-03-10T18:36:10.893261Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-10T18:36:28.380644Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-10T18:36:30.095263Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-11T04:38:49.793548Z", "number": "10", "summary": "Unknown change." }, { "date": "2026-03-11T07:52:46.694823Z", "number": "11", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-03-11T08:06:02.742216Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| Products connected (5).| References created (3)." }, { "date": "2026-03-11T08:06:07.567608Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-11T13:18:01.393577Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-11T15:01:11.374699Z", "number": "15", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-11T15:01:17.502702Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-03-11T20:40:56.633340Z", "number": "17", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-11T20:40:59.651521Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-03-12T10:26:17.648547Z", "number": "19", "summary": "Products connected (3).| Products removed (2).| References created (2)." }, { "date": "2026-03-13T00:27:59.169532Z", "number": "20", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (12).| Product Identifiers created (3).| Product Remediations created (14).| Products created (2).| References created (3).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-13T00:28:06.357106Z", "number": "21", "summary": "NCSC Score updated." }, { "date": "2026-03-13T08:23:46.915179Z", "number": "22", "summary": "Products connected (2).| References created (11)." }, { "date": "2026-03-13T08:23:48.929095Z", "number": "23", "summary": "NCSC Score updated." }, { "date": "2026-03-16T10:37:57.276039Z", "number": "24", "summary": "Products connected (1).| References created (11)." }, { "date": "2026-03-16T10:37:59.160745Z", "number": "25", "summary": "NCSC Score updated." }, { "date": "2026-03-19T15:30:39.538476Z", "number": "26", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-19T15:30:41.702298Z", "number": "27", "summary": "NCSC Score updated." }, { "date": "2026-03-19T21:09:47.740844Z", "number": "28", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:44:40.372331Z", "number": "29", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T18:19:54.106258Z", "number": "30", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1).| Unknown change." }, { "date": "2026-03-20T18:19:56.009376Z", "number": "31", "summary": "NCSC Score updated." }, { "date": "2026-04-01T21:22:55.908825Z", "number": "32", "summary": "NCSC Score updated." }, { "date": "2026-04-01T23:25:07.764409Z", "number": "33", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| Product Identifiers created (1).| References created (1).| CWES updated (1)." }, { "date": "2026-04-01T23:25:12.191958Z", "number": "34", "summary": "NCSC Score updated." } ], "status": "interim", "version": "34" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/10", "product": { "name": "vers:unknown/10", "product_id": "CSAFPID-5810232", "product_identification_helper": { "cpe": "cpe:/a:microsoft:.net:10.0" } } }, { "category": "product_version_range", "name": "vers:unknown/9", "product": { "name": "vers:unknown/9", "product_id": "CSAFPID-5810233", "product_identification_helper": { "cpe": "cpe:/a:microsoft:.net:9.0" } } } ], "category": "product_name", "name": ".NET" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/10.0.0|<10.0.4", "product": { "name": "vers:unknown/10.0.0|<10.0.4", "product_id": "CSAFPID-5775344" } } ], "category": "product_name", "name": ".NET 10.0" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/10.0.0", "product": { "name": "vers:microsoft/10.0.0", "product_id": "CSAFPID-5590019", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:.net:10.0.0:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": ".NET 10.0 installed on Linux" } ], "category": "product_family", "name": "Developer Tools" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=10.0.0|<10.0.4", "product": { "name": "vers:unknown/>=10.0.0|<10.0.4", "product_id": "CSAFPID-5982862", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": ".net" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/core 10.0", "product": { "name": "vers:unknown/core 10.0", "product_id": "CSAFPID-5793557", "product_identification_helper": { "cpe": "cpe:/a:microsoft:asp.net:core_10.0" } } }, { "category": "product_version_range", "name": "vers:unknown/core 8.0", "product": { "name": "vers:unknown/core 8.0", "product_id": "CSAFPID-2470410", "product_identification_helper": { "cpe": "cpe:/a:microsoft:asp.net:core_8.0" } } }, { "category": "product_version_range", "name": "vers:unknown/core 9.0", "product": { "name": "vers:unknown/core 9.0", "product_id": "CSAFPID-2470409", "product_identification_helper": { "cpe": "cpe:/a:microsoft:asp.net:core_9.0" } } } ], "category": "product_name", "name": "ASP.NET" } ], "category": "vendor", "name": "Microsoft" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317177", "product_identification_helper": { "cpe": "cpe:/o:oracle:linux:-" } } } ], "category": "product_name", "name": "Oracle Linux" } ], "category": "vendor", "name": "Oracle" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1330300", "product_identification_helper": { "cpe": "cpe:/o:resf:rocky_linux:-" } } } ], "category": "product_name", "name": "RESF Rocky Linux" } ], "category": "vendor", "name": "RESF" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317175", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:5::server" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/10", "product": { "name": "vers:rpm/10", "product_id": "CSAFPID-2858634", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:10" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439317", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:8" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/9", "product": { "name": "vers:rpm/9", "product_id": "CSAFPID-1439319", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:9" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5068016" } } ], "category": "product_name", "name": "dotnet10.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5811195" } } ], "category": "product_name", "name": "dotnet8.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5811221" } } ], "category": "product_name", "name": "dotnet9.0" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5811224" } } ], "category": "product_name", "name": "dotnet10.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1780155" } } ], "category": "product_name", "name": "dotnet8.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1780156" } } ], "category": "product_name", "name": "dotnet9.0" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5068032" } } ], "category": "product_name", "name": "dotnet10.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1780157" } } ], "category": "product_name", "name": "dotnet6.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459359" } } ], "category": "product_name", "name": "dotnet7.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1780158" } } ], "category": "product_name", "name": "dotnet8.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1780159" } } ], "category": "product_name", "name": "dotnet9.0" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1330299", "product_identification_helper": { "cpe": "cpe:/o:canonical:ubuntu_linux:-" } } } ], "category": "product_name", "name": "Ubuntu Linux" } ], "category": "vendor", "name": "Ubuntu" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-26131", "cwe": { "id": "CWE-276", "name": "Incorrect Default Permissions" }, "notes": [ { "category": "description", "text": "Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-26131" }, { "category": "description", "text": "

Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.

\n", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "description", "text": "Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-26131" }, { "category": "description", "text": "# Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability\n\n## Executive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. \n\nAn elevation of privilege vulnerability exists in .NET due to improper authorization. Incorrect packaging permissions could allow an attacker to gain elevated privileges.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/386\n\n## CVSS Details\n\n- **Severity:** High\n- **Version:** 3.1\n- **Score:** 7.8\n- **Vector:** `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`\n- **Weakness:** CWE-276 (Incorrect Default Permissions)\n\n## Affected Platforms\n\n- **Platforms:** Linux\n- **Architectures:** All\n\n## Affected Products\n\n### .NET 10\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-x64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-x64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n\n## Advisory FAQ\n\n### How do I know if I am affected?\n\nIf using an affected package listed in [affected products](#affected-products), you're exposed to the vulnerability.\n\n### How do I fix the issue?\n\n1. To fix the issue please install the latest version of .NET 10.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.\n2. If your application references the vulnerable package, update the package reference to the patched version. You can list the versions you have installed by running the `dotnet --info` command. \n\nOnce you have installed the updated runtime or SDK, restart your apps for the update to take effect.\n\nAdditionally, if you've deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).\n\nSecurity reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.\n\n### Support\n\nYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2026-26131]( https://www.cve.org/CVERecord?id=CVE-2026-26131)\n\n### Acknowledgements\n\nIgor Kovalchuk\n\n### Revisions\n\nV1.0 (March 10, 2026): Advisory published.", "title": "github - https://github.com/advisories/GHSA-crjq-wm6x-6qx7" }, { "category": "description", "text": "A flaw was found in .NET. Incorrect default permissions allow an authorized local attacker to exploit this vulnerability. This can lead to local privilege escalation, enabling the attacker to gain higher access rights on the system.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-26131" }, { "category": "description", "text": "# Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability\n\n## Executive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. \n\nAn elevation of privilege vulnerability exists in .NET due to improper authorization. Incorrect packaging permissions could allow an attacker to gain elevated privileges.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/386\n\n## CVSS Details\n\n- **Severity:** High\n- **Version:** 3.1\n- **Score:** 7.8\n- **Vector:** `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`\n- **Weakness:** CWE-276 (Incorrect Default Permissions)\n\n## Affected Platforms\n\n- **Platforms:** Linux\n- **Architectures:** All\n\n## Affected Products\n\n### .NET 10\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-x64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-x64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n\n## Advisory FAQ\n\n### How do I know if I am affected?\n\nIf using an affected package listed in [affected products](#affected-products), you're exposed to the vulnerability.\n\n### How do I fix the issue?\n\n1. To fix the issue please install the latest version of .NET 10.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.\n2. If your application references the vulnerable package, update the package reference to the patched version. You can list the versions you have installed by running the `dotnet --info` command. \n\nOnce you have installed the updated runtime or SDK, restart your apps for the update to take effect.\n\nAdditionally, if you've deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).\n\nSecurity reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.\n\n### Support\n\nYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2026-26131]( https://www.cve.org/CVERecord?id=CVE-2026-26131)\n\n### Acknowledgements\n\nIgor Kovalchuk\n\n### Revisions\n\nV1.0 (March 10, 2026): Advisory published.", "title": "github - https://api.github.com/advisories/GHSA-crjq-wm6x-6qx7" }, { "category": "description", "text": "Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/26xxx/CVE-2026-26131.json" }, { "category": "description", "text": "Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-26131" }, { "category": "other", "text": "0.00045", "title": "EPSS" }, { "category": "other", "text": "7.1", "title": "NCSC Score" }, { "category": "other", "text": "IMPACT as product threat category, VENDOR FIX as product remediation category, There is product data available from a private source, There is news data available from source Bleepingcomputer, There is cvss data available from a private source", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is product_remediation data available from source Redhat", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5775344", "CSAFPID-5590019", "CSAFPID-2470409", "CSAFPID-2470410", "CSAFPID-5793557", "CSAFPID-1317175", "CSAFPID-5810232", "CSAFPID-5810233", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-2858634", "CSAFPID-5068016", "CSAFPID-5068032", "CSAFPID-5811224", "CSAFPID-1317177", "CSAFPID-1330299", "CSAFPID-1330300", "CSAFPID-5982862" ], "known_not_affected": [ "CSAFPID-1459359", "CSAFPID-1780155", "CSAFPID-1780156", "CSAFPID-1780157", "CSAFPID-1780158", "CSAFPID-1780159", "CSAFPID-5811195", "CSAFPID-5811221" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-26131" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/26xxx/CVE-2026-26131.json" }, { "category": "external", "summary": "Source - microsoft", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "external", "summary": "Source - bleepingcomputer", "url": "https://www.bleepingcomputer.com/news/microsoft/microsoft-march-2026-patch-tuesday-fixes-2-zero-days-79-flaws/" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26131" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-26131" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0085" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0657.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-26131" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-crjq-wm6x-6qx7" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-crjq-wm6x-6qx7" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-26131" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-26131.json" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-crjq-wm6x-6qx7" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/26xxx/CVE-2026-26131.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-26131" }, { "category": "external", "summary": "News - bleepingcomputer", "url": "https://www.bleepingcomputer.com/news/microsoft/microsoft-march-2026-patch-tuesday-fixes-2-zero-days-79-flaws/" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; redhat", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26131" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0657.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0657" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://msrc.microsoft.com/update-guide/" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/dotnet/runtime/security/advisories/GHSA-crjq-wm6x-6qx7" }, { "category": "external", "summary": "Reference - github; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26131" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-crjq-wm6x-6qx7" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:4443" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:4450" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-26131" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:4456" }, { "category": "external", "summary": "Reference - certbundde", "url": "http://linux.oracle.com/errata/ELSA-2026-4454.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "http://linux.oracle.com/errata/ELSA-2026-4453.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "http://linux.oracle.com/errata/ELSA-2026-4445.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-4455.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-4458.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:4445" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:4454" }, { "category": "external", "summary": "Reference - certbundde", "url": "http://linux.oracle.com/errata/ELSA-2026-4451.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "http://linux.oracle.com/errata/ELSA-2026-4450.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://ubuntu.com/security/notices/USN-8085-1" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-4456.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4443" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4458" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4455" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4456" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4454" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4453" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4451" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4450" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://errata.build.resf.org/RLSA-2026:4445" }, { "category": "external", "summary": "Reference - certbundde", "url": "http://linux.oracle.com/errata/ELSA-2026-4443.html" } ], "remediations": [ { "category": "vendor_fix", "details": "5081276", "product_ids": [ "CSAFPID-5590019" ], "url": "https://dotnet.microsoft.com/download/dotnet/10.0" }, { "category": "mitigation", "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.", "product_ids": [ "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1459359", "CSAFPID-1780155", "CSAFPID-1780156", "CSAFPID-1780157", "CSAFPID-1780158", "CSAFPID-1780159", "CSAFPID-2858634", "CSAFPID-5068016", "CSAFPID-5068032", "CSAFPID-5811195", "CSAFPID-5811221", "CSAFPID-5811224" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C", "baseScore": 7.8, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1317175", "CSAFPID-1317177", "CSAFPID-1330299", "CSAFPID-1330300", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-2470409", "CSAFPID-2470410", "CSAFPID-2858634", "CSAFPID-5068016", "CSAFPID-5068032", "CSAFPID-5590019", "CSAFPID-5775344", "CSAFPID-5793557", "CSAFPID-5810232", "CSAFPID-5810233", "CSAFPID-5811224", "CSAFPID-5982862" ] } ], "threats": [ { "category": "exploit_status", "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely", "product_ids": [ "CSAFPID-5590019" ] }, { "category": "impact", "details": "Elevation of Privilege", "product_ids": [ "CSAFPID-5590019" ] }, { "category": "exploit_status", "details": "exploited" } ], "title": "CVE-2026-26131" } ] }