CVE-2026-25748

🔴 HIGH

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 Pro...

Published
Feb 12, 2026
Last Modified
Feb 19, 2026
Views
5
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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 Products (1)

goauthentik - authentik

Version: *

CVSS Scores

CVSS 3.1 8.6
8.6
HIGH
CVSS 2.0 8.6

Additional Information

Source
security-advisories@github.com
State
Analyzed

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