Roadiz is a polymorphic content management system based on a node system. Prior to versions 2.3.43, 2.5.45, 2.6.31, and 2.7.18, the roadiz/openid package generates an OIDC nonce in OAuth2LinkGenerator::generate() and includes it in the authorization request sent to the identity provider, but never stores it and never validates it on the callback. The OpenIdJwtConfigurationFactory validation chain does not include a nonce constraint, and OpenIdAuthenticator::authenticate() never checks the nonce claim in the returned ID token against a stored value. This issue has been patched in versions 2.3.43, 2.5.45, 2.6.31, and 2.7.18.

Affected: Packagist: roadiz/openid

### Summary The `roadiz/openid` package generates an OIDC nonce in `OAuth2LinkGenerator::generate()` and includes it in the authorization request sent to the identity provider, but **never stores it** and **never validates it** on the callback. The `OpenIdJwtConfigurationFactory` validation chain does not include a nonce constraint, and `OpenIdAuthenticator::authenticate()` never checks the nonce claim in the returned ID token against a stored value.

### Details In `src/OAuth2LinkGenerator.php`, a nonce is created and sent to the IdP: ```php 'nonce' => $this->tokenGenerator->generateToken(), ``` However, this value is neither stored in session, cache, nor any other persistent store.

In `src/OpenIdJwtConfigurationFactory.php`, the JWT validation constraints are: - `LooseValidAt` (expiry) - `PermittedFor` (audience) - `IssuedBy` (issuer) - `HostedDomain` (optional) - `UserInfoEndpoint` (optional)

**No nonce constraint is present.**

In `src/Authentication/OpenIdAuthenticator.php`, the `authenticate()` method validates the state CSRF token correctly (fixed in v2.7.10), but never retrieves a stored nonce or compares it against the `nonce` claim in the ID token.

### PoC 1. Obtain a valid ID token from a legitimate OIDC flow for a target user (e.g. via network interception, browser history leak, or referrer header exposure on a non-HTTPS redirect). 2. Replay the ID token: Since the nonce in the token is never cross-checked against a client-stored value, the token passes all va…