TI-2026-20816 Aliases CVE-2026-25748

authentik has a forward authentication bypass with broken cookie

MEDIUM 44CWE-287Published 2026-02-12 · Updated 2026-02-17

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00679 52nd percentileScored 2026-11-07

Fix Fixed authentik (goauthentik): 2025.10.4, 2025.12.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
goauthentik	authentik	2025.10.0-rc1 to before 2025.10.4; 2025.10.0-rc1 to before 2025.12.4	2025.10.4, 2025.12.4	Patch available	CNA

authentik Vendorgoauthentik Affected 2025.10.0-rc1 to before 2025.10.4; 2025.10.0-rc1 to before 2025.12.4 Fixed in 2025.10.4, 2025.12.4 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:goauthentik:authentik::::::::	before 2025.10.4; 2025.12.0 to before 2025.12.4	Vulnerable	goauthentik

cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:* Versions before 2025.10.4; 2025.12.0 to before 2025.12.4 Vulnerable ·goauthentik

Remediation

Fix · CNA authentik (goauthentik) Fixed in 2025.10.4, 2025.12.4

Timeline

2026-10-02 Threatist record created from CVE-2026-25748

References

Advisory 1

https://github.com/goauthentik/authentik/security/advisories/GHSA-fj56-5763-j8pp

Other 2

TI-2026-36603 authentik: SourceStage bypass via empty POST CVSS 3.1CRITICAL 9.8
TI-2022-07608 authentik vulnerable to Improper Authentication via invitation URL token reuse CVSS 3.1CRITICAL 9.4
TI-2026-36598 authentik: `UserSourceConnection.user` and `GroupSourceConnection.group` are changeable through the API CVSS 3.1HIGH 8.8
TI-2022-22816 authentik allows existing authenticated users to create arbitrary accounts CVSS 3.1MEDIUM 6.4
TI-2024-25628 Insufficient access control for OAuth2 Device Code flow in authentik CVSS 3.1CRITICAL 9.8
TI-2023-24876 authentik potential installation takeover when default admin user is deleted CVSS 3.1CRITICAL 9.8

See all 32 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences