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...

CVE-2026-25748

The vulnerability CVE-2026-25748 affects authentik prior to 2025.10.4 and 2025.12.4 in the Proxy Provider when used with Traefik or Caddy as reverse proxy. A malformed cookie could bypass authentication during forward authentication, causing missing authentik headers (X-Authentik-*) and potential...

Flickr: Critical broken cookie signing on dagobah.flickr.com

In this report it was discovered that we were signing one of our cookies with a weak, static secret key. To fix this, we replaced the aforementioned weak, static key with a more robust and secure system for signing that cookie...