CVE-2026-87004

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.31.3, when the OIDC login flow completes, backend/modules/auth/providers/auth_oidc_provider.py decodes the id_token returned by the identity provider's token endpoint using jose.jwt.get_unverified_claims() instead of jwt.decode(). This skips signature verification, audience (aud) validation, issuer (iss) validation, and expiry (exp) checking entirely. The extracted claims (email/sub/preferred_username) are then used directly as the user_id for the resulting Tugtainer session. This issue has been patched in version 1.31.3.

• https://github.com/Quenary/tugtainer/commit/b55269b6a3bfd43b0f2f5bd5f137ee0c81b7c2e4
• https://github.com/Quenary/tugtainer/releases/tag/v1.31.3
• https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh
• https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh