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CVE-2026-25748— authentik has a forward authentication bypass with broken cookie

Quick assessment

Affected
goauthentik authentik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

authentik是authentik开源的一个开源身份提供应用程序。 authentik 2025.10.4之前版本和2025.12.4之前版本存在授权问题漏洞，该漏洞源于使用畸形Cookie时可能绕过身份验证，可能导致攻击者获得访问权限。

CVSS 8.6 · High EPSS 0.78% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-25748

Vulnerability Information
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Vulnerability Title
authentik has a forward authentication bypass with broken cookie
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
authentik是authentik开源的一个开源身份提供应用程序。 authentik 2025.10.4之前版本和2025.12.4之前版本存在授权问题漏洞，该漏洞源于使用畸形Cookie时可能绕过身份验证，可能导致攻击者获得访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
goauthentik authentik >= 2025.10.0-rc1, < 2025.10.4 -

II. Public POCs for CVE-2026-25748

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III. Intelligence Information for CVE-2026-25748

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Vendor Advisories for CVE-2026-25748 (1)

Same Patch Batch · goauthentik · 2026-02-12 · 3 CVEs total

CVE-2026-25227 9.1 CRITICAL authentik affected by Remote Code Execution via Context Key Injection in PropertyMapping T
CVE-2026-25922 8.8 HIGH authentik has a Signature Verification Bypass via SAML Assertion Wrapping

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-287

V. Comments for CVE-2026-25748

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