Vulnerability · Published Feb 12, 2026 · Assigned by GitHub_M
CVE-2026-25748authentik has a forward authentication bypass with broken cookie
High 8.6
In plain English
A high-severity improper authentication in authentik from goauthentik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| goauthentik | authentik | >= 2025.10.0-rc1, < 2025.10.4>= 2025.10.0-rc1, < 2025.12.4 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N