Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.9%
CVSS Severity
CVSS v3 Score 8.6
References
Products affected by CVE-2026-25748
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cpe:2.3:a:goauthentik:authentik:*
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cpe:2.3:a:goauthentik:authentik:2025.12.0
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cpe:2.3:a:goauthentik:authentik:2025.12.1
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cpe:2.3:a:goauthentik:authentik:2025.12.2
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cpe:2.3:a:goauthentik:authentik:2025.12.3