CVE-2026-25748

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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4	Product Release Notes
https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4	Product Release Notes
https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:goauthentik:authentik::::::::
	cpe:2.3:a:goauthentik:authentik::::::::

History

19 Feb 2026, 15:23

Type	Values Removed	Values Added
CPE		cpe:2.3:a:goauthentik:authentik::::::::
First Time		Goauthentik authentik Goauthentik
References	~~() https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4 -~~	() https://github.com/goauthentik/authentik/releases/tag/version%2F2025.10.4 - Product, Release Notes
References	~~() https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4 -~~	() https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.4 - Product, Release Notes
References	~~() https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp -~~	() https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp - Vendor Advisory

12 Feb 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-02-12 20:16

Updated : 2026-02-19 15:23

NVD link : CVE-2026-25748

Mitre link : CVE-2026-25748

CVE.ORG link : CVE-2026-25748

JSON object : View

Products Affected

goauthentik

authentik

CWE

CWE-287

Improper Authentication

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