CVE-2026-41671

CVE-2026-41671 · Admidio: OIDC Token Introspection Endpoint Returns Active for All Tokens Without Validation

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Admidio is an open-source user management solution. Prior to version 5.0.9, the OIDC token introspection endpoint (/modules/sso/index.php/oidc/introspect) always returns {"active": true} for every request, regardless of whether a valid token is provided, whether the token is expired, revoked, or completely fabricated. The endpoint performs no authentication of the calling resource server and no validation of the submitted token. Any resource server that relies on this introspection endpoint to validate access tokens will accept all requests as authorized, enabling complete authentication bypass. Additionally, the OIDC token revocation endpoint (/oidc/revoke) returns {"revoked": true} without actually revoking any token, preventing resource servers from invalidating compromised credentials. This issue has been patched in version 5.0.9.

CVSS 6.8 · Medium · EPSS 0.3% · Fix available

Published

2026-05-07T03:00:55.645Z

Updated

2026-05-07T12:46:28.521Z

Stack: php

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