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Vulnerability record · CVE-2026-25748 · published 12 February 2026

CVE-2026-25748: Goauthentik authentik improper authentication vulnerability

Goauthentik · Authentik

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.

7.5 CVSS 3.1 High EPSS 0.77% · top 46.3% CWE-287 · Improper authentication
7.5CVSS 3.1 base score
0.77%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-25748), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.