{ "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-2026-33252", "tracking": { "current_release_date": "2026-03-29T16:14:24.487561Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33252", "initial_release_date": "2026-03-20T15:28:52.826487Z", "revision_history": [ { "date": "2026-03-20T15:28:52.826487Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T15:28:57.672959Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-20T18:25:46.740239Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)." }, { "date": "2026-03-20T18:25:57.307623Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:44:56.984612Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)." }, { "date": "2026-03-24T20:44:59.049161Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:53:51.552535Z", "number": "7", "summary": "Unknown change." }, { "date": "2026-03-24T20:54:42.612711Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (15).| Product Identifiers created (5).| Product Remediations created (15).| References created (4).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-24T20:54:48.362116Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:57:44.278754Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-24T20:57:48.219339Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-24T21:37:44.910067Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-25T18:12:57.478215Z", "number": "13", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (2)." }, { "date": "2026-03-25T18:13:00.168943Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-25T21:50:32.727131Z", "number": "15", "summary": "References created (1)." }, { "date": "2026-03-26T00:12:59.680364Z", "number": "16", "summary": "References created (1)." }, { "date": "2026-03-29T03:16:16.655396Z", "number": "17", "summary": "References removed (1)." }, { "date": "2026-03-29T03:16:20.066566Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-03-29T16:14:23.119934Z", "number": "19", "summary": "References created (1)." } ], "status": "interim", "version": "19" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/2", "product": { "name": "vers:rpm/2", "product_id": "CSAFPID-1919968", "product_identification_helper": { "cpe": "cpe:/a:redhat:migration_toolkit_virtualization:2" } } } ], "category": "product_name", "name": "Migration Toolkit for Virtualization" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2524222", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift_lightspeed" } } } ], "category": "product_name", "name": "OpenShift Lightspeed" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/1", "product": { "name": "vers:rpm/1", "product_id": "CSAFPID-1441076", "product_identification_helper": { "cpe": "cpe:/a:redhat:serverless:1" } } } ], "category": "product_name", "name": "OpenShift Serverless" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1439279", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift_ai" } } } ], "category": "product_name", "name": "Red Hat OpenShift AI (RHOAI)" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/3", "product": { "name": "vers:rpm/3", "product_id": "CSAFPID-1441150", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift_devspaces:3:" } } } ], "category": "product_name", "name": "Red Hat OpenShift Dev Spaces" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5597158" } } ], "category": "product_name", "name": "kn-client-kn-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5207394" } } ], "category": "product_name", "name": "kn-plugin-func-func-util-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5207395" } } ], "category": "product_name", "name": "openshift-serverless-clients" } ], "category": "product_family", "name": "OpenShift Serverless" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1496183" } } ], "category": "product_name", "name": "mtv-api-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5736836" } } ], "category": "product_name", "name": "mtv-cli-download-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2485095" } } ], "category": "product_name", "name": "mtv-controller-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5736837" } } ], "category": "product_name", "name": "mtv-operator-bundle" } ], "category": "product_family", "name": "Migration Toolkit for Virtualization" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5222758" } } ], "category": "product_name", "name": "odh-mod-arch-gen-ai-rhel9" } ], "category": "product_family", "name": "Red Hat OpenShift AI (RHOAI)" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5157306" } } ], "category": "product_name", "name": "openshift-mcp-server-rhel9" } ], "category": "product_family", "name": "OpenShift Lightspeed" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2652733" } } ], "category": "product_name", "name": "udi-rhel9" } ], "category": "product_family", "name": "Red Hat OpenShift Dev Spaces" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<1.4.1", "product": { "name": "vers:unknown/<1.4.1", "product_id": "CSAFPID-5902050" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<1.4.1", "product": { "name": "vers:unknown/>=0|<1.4.1", "product_id": "CSAFPID-5874507" } } ], "category": "product_name", "name": "go-sdk" } ], "category": "vendor", "name": "modelcontextprotocol" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33252", "cwe": { "id": "CWE-352", "name": "Cross-Site Request Forgery (CSRF)" }, "notes": [ { "category": "description", "text": "The Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution.\n\n#### Impact:\n\nA malicious website may have been able to send cross-site POST requests with `Content-Type: text/plain`, which due to CORS-safelisted properties would reach the MCP message handling without any CORS preflight barrier.\n\n#### Fix:\n\nThe SDK was modified to perform `Content-Type` header validation for POST requests and introduced a configurable protection for verifying the origin of the request in commit a433a83. Users are advised to update to v1.4.1 to use this additional protection.\n\nNote: v1.4.1 requires Go 1.25 or later.\n\n#### Credits:\n\nThank you to Lê Minh Quân for reporting the issue.", "title": "github - https://api.github.com/advisories/GHSA-89xv-2j6f-qhc8" }, { "category": "description", "text": "The Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution.\n\n#### Impact:\n\nA malicious website may have been able to send cross-site POST requests with `Content-Type: text/plain`, which due to CORS-safelisted properties would reach the MCP message handling without any CORS preflight barrier.\n\n#### Fix:\n\nThe SDK was modified to perform `Content-Type` header validation for POST requests and introduced a configurable protection for verifying the origin of the request in commit a433a83. Users are advised to update to v1.4.1 to use this additional protection.\n\nNote: v1.4.1 requires Go 1.25 or later.\n\n#### Credits:\n\nThank you to Lê Minh Quân for reporting the issue.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-89xv-2j6f-qhc8.json?alt=media" }, { "category": "description", "text": "The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution. Version 1.4.1 contains a patch for the issue.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33252.json" }, { "category": "description", "text": "A flaw was found in the Go MCP SDK's Streamable HTTP transport, which uses Go's standard `encoding/json` package. In deployments without authorization, a remote attacker can exploit this Cross-Site Request Forgery (CSRF) vulnerability. By sending browser-generated cross-site `POST` requests to a local server without proper validation of the `Origin` header or `Content-Type`, an attacker can potentially trigger unauthorized tool execution.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33252.json" }, { "category": "description", "text": "The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution. Version 1.4.1 contains a patch for the issue.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33252" }, { "category": "description", "text": "Cross-Site Tool Execution for HTTP Servers without Authorizatrion in github.com/modelcontextprotocol/go-sdk", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4773.json?alt=media" }, { "category": "other", "text": "6e-05", "title": "EPSS" }, { "category": "other", "text": "4.5", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is product_remediation data available from source Redhat, Is related to CWE-352 (Cross-Site Request Forgery (CSRF))", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5874507", "CSAFPID-5902050", "CSAFPID-1439279", "CSAFPID-1441076", "CSAFPID-1441150", "CSAFPID-1496183", "CSAFPID-1919968", "CSAFPID-2485095", "CSAFPID-2524222", "CSAFPID-2652733", "CSAFPID-5157306", "CSAFPID-5207394", "CSAFPID-5207395", "CSAFPID-5222758", "CSAFPID-5597158", "CSAFPID-5736836", "CSAFPID-5736837" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-89xv-2j6f-qhc8" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-89xv-2j6f-qhc8.json?alt=media" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33252.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33252.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33252" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4773.json?alt=media" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-89xv-2j6f-qhc8" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/modelcontextprotocol/go-sdk/commit/a433a831d6e5d5ac3b9e625a8095aa8eaa040dfc" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-89xv-2j6f-qhc8" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33252" }, { "category": "external", "summary": "Reference - github; osv; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33252" } ], "remediations": [ { "category": "mitigation", "details": "To mitigate this vulnerability, ensure that deployments utilizing the Go MCP SDK are configured with proper authorization mechanisms. This prevents unauthorized cross-site requests from triggering tool execution. Additionally, restrict network access to the local server running the SDK to trusted sources only, using firewall rules to limit exposure.", "product_ids": [ "CSAFPID-1439279", "CSAFPID-1441076", "CSAFPID-1441150", "CSAFPID-1496183", "CSAFPID-1919968", "CSAFPID-2485095", "CSAFPID-2524222", "CSAFPID-2652733", "CSAFPID-5157306", "CSAFPID-5207394", "CSAFPID-5207395", "CSAFPID-5222758", "CSAFPID-5597158", "CSAFPID-5736836", "CSAFPID-5736837" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L", "baseScore": 7.1, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1439279", "CSAFPID-1441076", "CSAFPID-1441150", "CSAFPID-1496183", "CSAFPID-1919968", "CSAFPID-2485095", "CSAFPID-2524222", "CSAFPID-2652733", "CSAFPID-5157306", "CSAFPID-5207394", "CSAFPID-5207395", "CSAFPID-5222758", "CSAFPID-5597158", "CSAFPID-5736836", "CSAFPID-5736837", "CSAFPID-5874507", "CSAFPID-5902050" ] } ], "title": "CVE-2026-33252" } ] }