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CVE

CVE-2026-25748

authentik has a forward authentication bypass with broken cookie
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CVE

CVE-2026-25748

authentik has a forward authentication bypass with broken cookie

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25748.json, https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4, https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4, https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp, https://nvd.nist.gov/vuln/detail/CVE-2026-25748

Severity

8.6

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.6
EPSS Probability
0.00035%
EPSS Percentile
0.10288%
Introduced Version
6d1c7f90e2da9c2c4bc27a6c8784c4130e6fe822
Fix Available
19ad8d3ae3f266ec1096bc4461fdf6bcda1aa079

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