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CVE-2026-25748

authentik has a forward authentication bypass with broken cookie PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
goauthentik / authentikaffected >= 2025.10.0-rc1, < 2025.10.4; affected >= 2025.10.0-rc1, < 2025.12.4

CWE

CWE-287

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.