CVE-2026-25748 HIGH

CVE-2026-25748: authentik has a forward authentication bypass with broken cookie

Vendor Goauthentik
Product authentik
Weakness CWE-287 · Improper authentication
Published February 12, 2026
Last update February 17, 2026
View on NVD All CVEs

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 12, 2026 CVE published
February 17, 2026 Record updated