{"id":"CVE-2026-25748","state":"PUBLISHED","title":"authentik has a forward authentication bypass with broken cookie","description":"authentik is an open-source identity provider. Prior to 2025.10.4 and 2025.12.4, with a malformed cookie it was possible to bypass authentication when using forward authentication in the authentik Proxy Provider when used in conjunction with Traefik or Caddy as reverse proxy. When a malicious cookie was used, none of the authentik-specific X-Authentik-* headers were set which depending on application can grant access to an attacker. authentik 2025.10.4 and 2025.12.4 fix this issue.","publishedAt":"2026-02-12T19:36:45.631Z","updatedAt":"2026-02-17T15:53:01.301Z","severity":{"score":8.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["goauthentik authentik"],"affected":[{"vendor":"goauthentik","product":"authentik","versions":[{"version":">= 2025.10.0-rc1, < 2025.10.4","status":"affected"},{"version":">= 2025.10.0-rc1, < 2025.12.4","status":"affected"}]}],"references":["https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp","https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4","https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4"],"weaknesses":["CWE-287"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25748.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25748","state":"PUBLISHED","datePublished":"2026-02-12T19:36:45.631Z","dateUpdated":"2026-02-17T15:53:01.301Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-05T18:35:52.356Z"},"containers":{"cna":{"title":"authentik has a forward authentication bypass with broken cookie","descriptions":[{"lang":"en","value":"authentik is an open-source identity provider. Prior to 2025.10.4 and 2025.12.4, with a malformed cookie it was possible to bypass authentication when using forward authentication in the authentik Proxy Provider when used in conjunction with Traefik or Caddy as reverse proxy. When a malicious cookie was used, none of the authentik-specific X-Authentik-* headers were set which depending on application can grant access to an attacker. authentik 2025.10.4 and 2025.12.4 fix this issue."}],"affected":[{"vendor":"goauthentik","product":"authentik","versions":[{"version":">= 2025.10.0-rc1, < 2025.10.4","status":"affected"},{"version":">= 2025.10.0-rc1, < 2025.12.4","status":"affected"}]}],"references":[{"url":"https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp","name":"https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4","name":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4","tags":["x_refsource_MISC"]},{"url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4","name":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-287","lang":"en","description":"CWE-287: Improper Authentication","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-12T19:36:45.631Z"},"source":{"advisory":"GHSA-fj56-5763-j8pp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-17T15:52:54.989237Z","id":"CVE-2026-25748","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-17T15:53:01.301Z"}}]}}}