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CVE-2026-25748

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2578e9abf1082fe1cac86d51b3d883e1c1b160467d57ade00779bebed1a6a2b6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"authentik","vendor":"goauthentik","versions":[{"status":"affected","version":">= 2025.10.0-rc1, < 2025.10.4"},{"status":"affected","version":">= 2025.10.0-rc1, < 2025.12.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3df82308de09ae3af27b5dfe741fbf4c6f02a5282b7473f1e59e904f22610556 · sha256:962da8cb09a786e2… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3df82308de09ae3af27b5dfe741fbf4c6f02a5282b7473f1e59e904f22610556 · sha256:962da8cb09a786e2… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3df82308de09ae3af27b5dfe741fbf4c6f02a5282b7473f1e59e904f22610556 · sha256:962da8cb09a786e2… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"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%2F2025.10.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3df82308de09ae3af27b5dfe741fbf4c6f02a5282b7473f1e59e904f22610556 · sha256:962da8cb09a786e2… · /containers/cna/references/1
{"name":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4","tags":["x_refsource_MISC"],"url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3df82308de09ae3af27b5dfe741fbf4c6f02a5282b7473f1e59e904f22610556 · sha256:962da8cb09a786e2… · /containers/cna/references/2
{"name":"https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3df82308de09ae3af27b5dfe741fbf4c6f02a5282b7473f1e59e904f22610556 · sha256:962da8cb09a786e2… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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