CVE-2026-25748
High
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.
SeverityHigh
CVSS8.6
Exploit probability—
ProductAuthentik
PublishedFeb 12, 2026
First seenFeb 12, 2026
Weakness typeCWE-287Improper authentication
How to fix
Update
- goauthentik authentik2025.10.4, 2025.12.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| goauthentik authentik | v < 2025.10.4, 2025.12.0 ≤ v < 2025.12.4 | 2025.10.4, 2025.12.4 |
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