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EUVD-2026-308948

fkie_cve-2026-41671

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.

GHSA-9xx5-cv6j-x533 — Admidio: OIDC Token Introspection Endpoint Returns Active for All Tokens Without Validation

Affected: Packagist: admidio/admidio

## Summary

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.

## Details

The vulnerability is in `src/SSO/Service/OIDCService.php`, lines 604-619:

```php public function handleIntrospectionRequest() { // TODO_RK if (!$this->isServiceSetup) { $this->setupService(); } return new JsonResponse(["active" => true]); }

public function handleRevocationRequest() { // TODO_RK if (!$this->isServiceSetup) { $this->setupService(); }

return new JsonResponse(["revoked" => true]); } ```

The introspection endpoint is routed at `modules/sso/index.php`, line 58-59:

```php } elseif (strpos($requestUri, '/oidc/introspect') !== false) { $response = $oidcService->handleIntrospectionRequest(); ```

The router comment at line 35 says "Login checks will be done in the ind…