{"id":"CVE-2026-25748","aliases":["BIT-authentik-2026-25748","EUVD-2026-6702","GHSA-fj56-5763-j8pp"],"status":"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.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00669,"percentile":0.52414,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-287"],"published":"2026-02-12T19:36:45Z","modified":"2026-10-28T02:30:32Z","fixes":[{"ecosystem":"Bitnami","package":"authentik","fixed_in":["2025.12.4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"authentik","ranges":[{"type":"SEMVER","events":[{"introduced":"2025.10.0"},{"fixed":"2025.12.4"}]}]}],"products":[{"vendor":"goauthentik","product":"authentik"}],"references":[{"url":"https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory"]},{"url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4","tags":["x_refsource_MISC","Product","Release Notes","article","web"]},{"url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4","tags":["x_refsource_MISC","Product","Release Notes","article","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25748","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25748.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-25748","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.","status":"published","published":"2026-02-12T19:36:45.631Z","modified":"2026-02-17T15:53:01.301Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T13:41:19.694734Z"}],"euvd":[{"id":"EUVD-2026-6702","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.","status":"published","published":"2026-02-12T19:36:45Z","modified":"2026-02-17T15:53:01Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T19:48:37.939014Z"}],"nvd":[{"id":"CVE-2026-25748","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.","status":"published","published":"2026-02-12T20:16:10.473Z","modified":"2026-06-17T10:25:09.8Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:12:05.908608Z"}],"osv":[{"id":"CVE-2026-25748","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.","status":"published","published":"2026-02-12T19:36:45.631Z","modified":"2026-10-28T02:30:32.962802028Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:44:59.438965Z"},{"id":"BIT-authentik-2026-25748","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.","status":"published","published":"2026-04-16T23:36:33.948Z","modified":"2026-09-08T08:45:49.407379622Z","updated_at":"2026-11-02T15:28:28.70813Z"}]}}