{ "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-2026-4366", "tracking": { "current_release_date": "2026-04-01T15:36:17.978677Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-4366", "initial_release_date": "2026-03-18T04:25:48.935952Z", "revision_history": [ { "date": "2026-03-18T04:25:48.935952Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T04:25:55.500306Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-18T04:38:38.123798Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T04:38:44.193608Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-18T07:35:31.417376Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-18T12:05:39.525741Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Products connected (1).| Product Identifiers created (1).| References created (5)." }, { "date": "2026-03-18T12:05:46.011657Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-18T12:27:45.410744Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (10).| Product Identifiers created (4).| Product Remediations created (10).| References created (2).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-18T12:27:55.768441Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-18T15:53:57.459628Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-18T15:54:02.390213Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-18T18:39:00.145278Z", "number": "12", "summary": "Unknown change." }, { "date": "2026-03-20T09:26:07.125075Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:26:28.865777Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-04-01T15:36:14.236298Z", "number": "15", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Identifiers created (4).| References created (2).| CWES updated (1)." }, { "date": "2026-04-01T15:36:16.666711Z", "number": "16", "summary": "NCSC Score updated." } ], "status": "interim", "version": "16" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1344702", "product_identification_helper": { "cpe": "cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*" } } } ], "category": "product_name", "name": "Build of Keycloak" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1421880", "product_identification_helper": { "cpe": "cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "Enterprise Application Platform EAP Expansion Pack" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1439290", "product_identification_helper": { "cpe": "cpe:/a:redhat:build_keycloak:" } } } ], "category": "product_name", "name": "Red Hat Build of Keycloak" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439302", "product_identification_helper": { "cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8" } } } ], "category": "product_name", "name": "Red Hat JBoss Enterprise Application Platform 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1439304", "product_identification_helper": { "cpe": "cpe:/a:redhat:jbosseapxp" } } } ], "category": "product_name", "name": "Red Hat JBoss Enterprise Application Platform Expansion Pack" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/7", "product": { "name": "vers:rpm/7", "product_id": "CSAFPID-1439308", "product_identification_helper": { "cpe": "cpe:/a:redhat:red_hat_single_sign_on:7" } } } ], "category": "product_name", "name": "Red Hat Single Sign-On 7" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/8.0.0", "product": { "name": "vers:unknown/8.0.0", "product_id": "CSAFPID-2693342", "product_identification_helper": { "cpe": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:8.0.0:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "jboss_enterprise_application_platform" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5450753" } } ], "category": "product_name", "name": "keycloak-operator-bundle" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5011677" } } ], "category": "product_name", "name": "keycloak-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5270705" } } ], "category": "product_name", "name": "keycloak-rhel9-operator" } ], "category": "product_family", "name": "Red Hat Build of Keycloak" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2986456" } } ], "category": "product_name", "name": "keycloak-services" } ], "category": "product_family", "name": "Red Hat JBoss Enterprise Application Platform 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2986457" } } ], "category": "product_name", "name": "keycloak-services" } ], "category": "product_family", "name": "Red Hat JBoss Enterprise Application Platform Expansion Pack" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2563053" } } ], "category": "product_name", "name": "keycloak-services" } ], "category": "product_family", "name": "Red Hat Single Sign-On 7" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/7.0", "product": { "name": "vers:unknown/7.0", "product_id": "CSAFPID-2112025", "product_identification_helper": { "cpe": "cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "single_sign-on" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-2170821", "product_identification_helper": { "cpe": "cpe:/a:keycloak:keycloak:-" } } } ], "category": "product_name", "name": "Open Source Keycloak" } ], "category": "vendor", "name": "Open Source" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-4366", "cwe": { "id": "CWE-918", "name": "Server-Side Request Forgery (SSRF)" }, "notes": [ { "category": "description", "text": "A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-4366" }, { "category": "description", "text": "A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-4366" }, { "category": "description", "text": "A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.\nMODERATE impact: Keycloak is vulnerable to a blind Server-Side Request Forgery (SSRF) due to improper handling of HTTP redirects during client configuration. An attacker can exploit this remotely without authentication or user interaction by crafting a `sector_identifier_uri` that redirects to internal resources, potentially leading to information disclosure and internal network reconnaissance.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-4366" }, { "category": "description", "text": "A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4366" }, { "category": "other", "text": "0.00028", "title": "EPSS" }, { "category": "other", "text": "4.4", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "The value of the most recent EPSS score", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-2170821", "CSAFPID-1439290", "CSAFPID-1439302", "CSAFPID-1439304", "CSAFPID-1439308", "CSAFPID-2563053", "CSAFPID-2986456", "CSAFPID-2986457", "CSAFPID-5011677", "CSAFPID-5270705", "CSAFPID-5450753", "CSAFPID-1344702", "CSAFPID-1421880", "CSAFPID-2112025", "CSAFPID-2693342" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4366" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4366" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4366" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4366.json" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0768.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-4366" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4366.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-4366" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4366" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://access.redhat.com/security/cve/CVE-2026-4366" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; nvd", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448543" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0768.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0768" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/security/cve/cve-2026-4366" }, { "category": "external", "summary": "Reference - certbundde; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4366" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4366" } ], "remediations": [ { "category": "mitigation", "details": "To mitigate this vulnerability, restrict the outbound network access of the Keycloak instance. Configure firewall rules to prevent the Keycloak server from initiating connections to internal network segments, especially to well-known cloud metadata service IP addresses such as `169.254.169.254`. For example, on Red Hat Enterprise Linux, you can use `firewalld` to add a rich rule:\n`sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=\"ipv4\" destination address=\"169.254.169.254\" reject'`\n`sudo firewall-cmd --reload`\nThis may impact other services if they legitimately rely on accessing these internal IPs. Additionally, ensure that any configured `sector_identifier_uri` values are thoroughly validated to only point to trusted, external URLs that do not perform redirects to internal resources.", "product_ids": [ "CSAFPID-1439290", "CSAFPID-1439302", "CSAFPID-1439304", "CSAFPID-1439308", "CSAFPID-2563053", "CSAFPID-2986456", "CSAFPID-2986457", "CSAFPID-5011677", "CSAFPID-5270705", "CSAFPID-5450753" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N", "baseScore": 5.8, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1344702", "CSAFPID-1421880", "CSAFPID-1439290", "CSAFPID-1439302", "CSAFPID-1439304", "CSAFPID-1439308", "CSAFPID-2112025", "CSAFPID-2170821", "CSAFPID-2563053", "CSAFPID-2693342", "CSAFPID-2986456", "CSAFPID-2986457", "CSAFPID-5011677", "CSAFPID-5270705", "CSAFPID-5450753" ] } ], "title": "CVE-2026-4366" } ] }