{"id":"CVE-2025-11537","aliases":["EUVD-2025-207355","GHSA-gv3v-2cpp-3pmq"],"status":"published","title":"Keycloak-services: sensitive headers shown in the http access logs","description":"A flaw was found in Keycloak. When the logging format is configured to a verbose, user-supplied pattern (such as the pre-defined 'long' pattern), sensitive headers including Authorization and Cookie are disclosed to the logs in cleartext. An attacker with read access to the log files can extract these credentials (e.g., bearer tokens, session cookies) and use them to impersonate users, leading to a full account compromise.","severity":{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00171,"percentile":0.06555,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-117"],"published":"2026-02-10T10:53:28Z","modified":"2026-10-30T21:45:09Z","fixes":[{"ecosystem":"Maven","package":"org.keycloak:keycloak-quarkus-server","fixed_in":["26.5.6"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.keycloak:keycloak-quarkus-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.5.6"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.keycloak:keycloak-quarkus-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.5.6"}]}],"versions":["12.0.0","12.0.1","12.0.2","12.0.3","12.0.4","13.0.0","13.0.1","14.0.0","15.0.0","15.0.1","15.0.2","15.1.0","15.1.1","16.0.0","16.1.0","16.1.1","17.0.0","17.0.1","18.0.0","18.0.1","18.0.2","19.0.0","19.0.1","19.0.2","19.0.3","20.0.0","20.0.1","20.0.2","20.0.3","20.0.4","20.0.5","21.0.0","21.0.1","21.0.2","21.1.0","21.1.1","21.1.2","22.0.0","22.0.1","22.0.2","22.0.3","22.0.4","22.0.5","23.0.0","23.0.1","23.0.2","23.0.3","23.0.4","23.0.5","23.0.6","23.0.7","24.0.0","24.0.1","24.0.2","24.0.3","24.0.4","24.0.5","25.0.0","25.0.1","25.0.2","25.0.3","25.0.4","25.0.5","25.0.6","26.0.0","26.0.1","26.0.2","26.0.4","26.0.5","26.0.6","26.0.7","26.0.8","26.1.0","26.1.1","26.1.2","26.1.3","26.1.4","26.1.5","26.2.0","26.2.1","26.2.2","26.2.3","26.2.4","26.2.5","26.3.0","26.3.1","26.3.2","26.3.3","26.3.4","26.3.5","26.4.0","26.4.1","26.4.2","26.4.3","26.4.4","26.4.5","26.4.6","26.4.7","26.5.0","26.5.1","26.5.2","26.5.3","26.5.4","26.5.5"]}],"products":[{"vendor":"red hat","product":"red hat build of keycloak"},{"vendor":"red hat","product":"red hat build of keycloak 26.4.2"}],"references":[{"url":"https://access.redhat.com/errata/RHEA-2025:19385","tags":["vendor-advisory","x_refsource_REDHAT","web"]},{"url":"https://access.redhat.com/errata/RHEA-2025:19386","tags":["vendor-advisory","x_refsource_REDHAT","web"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-11537","tags":["vdb-entry","x_refsource_REDHAT","web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2402616","tags":["issue-tracking","x_refsource_REDHAT","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-11537","tags":["advisory"]},{"url":"https://github.com/keycloak/keycloak/commit/137a35c1109ff43a305f26264978a3ea21452373","tags":["web"]},{"url":"https://www.keycloak.org/server/logging#_change_log_formatpattern","tags":["web"]},{"url":"https://github.com/keycloak/keycloak/commit/5a3cdb7c4ccbf83ffc926f70d655a60269d7207b","tags":["web"]},{"url":"https://github.com/keycloak/keycloak/commit/9622f550a6e565b29a3a37454421f08626791a6c","tags":["web"]},{"url":"https://github.com/advisories/GHSA-gv3v-2cpp-3pmq"},{"url":"https://github.com/keycloak/keycloak","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-11537","title":"Keycloak-services: sensitive headers shown in the http access logs","description":"A flaw was found in Keycloak. When the logging format is configured to a verbose, user-supplied pattern (such as the pre-defined 'long' pattern), sensitive headers including Authorization and Cookie are disclosed to the logs in cleartext. An attacker with read access to the log files can extract these credentials (e.g., bearer tokens, session cookies) and use them to impersonate users, leading to a full account compromise.","status":"published","published":"2026-02-10T10:53:28.147Z","modified":"2026-10-30T18:31:04.417Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-117"],"updated_at":"2026-11-02T14:32:51.199669Z"}],"euvd":[{"id":"EUVD-2025-207355","description":"A flaw was found in Keycloak. When the logging format is configured to a verbose, user-supplied pattern (such as the pre-defined 'long' pattern), sensitive headers including Authorization and Cookie are disclosed to the logs in cleartext. An attacker with read access to the log files can extract these credentials (e.g., bearer tokens, session cookies) and use them to impersonate users, leading to a full account compromise.","status":"published","published":"2026-02-10T10:53:28Z","modified":"2026-10-30T18:31:04Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:59:02.630385Z"}],"ghsa":[{"id":"GHSA-gv3v-2cpp-3pmq","title":"Keycloak logs sensitive headers","description":"A flaw was found in Keycloak. When the logging format is configured to a verbose, user-supplied pattern (such as the pre-defined 'long' pattern), sensitive headers including Authorization and Cookie are disclosed to the logs in cleartext. An attacker with read access to the log files can extract these credentials (e.g., bearer tokens, session cookies) and use them to impersonate users, leading to a full account compromise.\n\nPatches are available, see:\n\n- https://github.com/keycloak/keycloak/releases/tag/26.4.11\n- https://github.com/keycloak/keycloak/releases/tag/26.5.6\n- https://github.com/keycloak/keycloak/releases/tag/26.6.0","status":"published","published":"2026-02-10T12:30:28Z","modified":"2026-10-30T21:31:49Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-117"],"updated_at":"2026-11-02T14:41:41.028239Z"}],"nvd":[{"id":"CVE-2025-11537","description":"A flaw was found in Keycloak. When the logging format is configured to a verbose, user-supplied pattern (such as the pre-defined 'long' pattern), sensitive headers including Authorization and Cookie are disclosed to the logs in cleartext. An attacker with read access to the log files can extract these credentials (e.g., bearer tokens, session cookies) and use them to impersonate users, leading to a full account compromise.","status":"published","published":"2026-02-10T11:16:09.397Z","modified":"2026-10-30T19:17:39.007Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-117"],"updated_at":"2026-11-02T14:11:59.832225Z"}],"osv":[{"id":"GHSA-gv3v-2cpp-3pmq","title":"Keycloak logs sensitive headers","description":"A flaw was found in Keycloak. When the logging format is configured to a verbose, user-supplied pattern (such as the pre-defined 'long' pattern), sensitive headers including Authorization and Cookie are disclosed to the logs in cleartext. An attacker with read access to the log files can extract these credentials (e.g., bearer tokens, session cookies) and use them to impersonate users, leading to a full account compromise.\n\nPatches are available, see:\n\n- https://github.com/keycloak/keycloak/releases/tag/26.4.11\n- https://github.com/keycloak/keycloak/releases/tag/26.5.6\n- https://github.com/keycloak/keycloak/releases/tag/26.6.0","status":"published","published":"2026-02-10T12:30:28Z","modified":"2026-10-30T21:45:09.451395048Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-117"],"updated_at":"2026-11-02T15:46:48.191583Z"}]}}