CVE-2026-25748

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-287

Affected software

Vendor	Product	Versions
goauthentik	authentik	>= 2025.10.0-rc1, < 2025.10.4; >= 2025.10.0-rc1, < 2025.12.4

References

https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4Product, Release Notes
https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4Product, Release Notes
https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8ppVendor Advisory

Timeline

Published: Feb 12, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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