{"id":"CVE-2026-42206","aliases":["GHSA-3gx8-q682-38mx"],"url":"https://o3.security/vulnerability/CVE-2026-42206","summary":"Roadiz OpenID Connect nonce generated but never validated — ID token replay attack","details":"### Summary\nThe `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.\n\n### Details\nIn `src/OAuth2LinkGenerator.php`, a nonce is created and sent to the IdP:\n```php\n'nonce' => $this->tokenGenerator->generateToken(),\n```\nHowever, this value is neither stored in session, cache, nor any other persistent store.\n\nIn `src/OpenIdJwtConfigurationFactory.php`, the JWT validation constraints are:\n- `LooseValidAt` (expiry)\n- `PermittedFor` (audience)\n- `IssuedBy` (issuer)\n- `HostedDomain` (optional)\n- `UserInfoEndpoint` (optional)\n\n**No nonce constraint is present.**\n\nIn `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.\n\n### PoC\n1. 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).\n2. Replay the ID token: Since the nonce in the token is never cross-checked against a client-stored value, the token passes all validation constraints as long as it has not expired.\n3. Result: An attacker can authenticate as the victim within the ID token's validity window.\n\nAdditionally, in an authorization code flow with multiple concurrent sessions, a malicious IdP or a compromised token endpoint could inject a token with a mismatched nonce, and the application would accept it silently.\n\n### Impact\n- **ID token replay attacks**: Valid but intercepted tokens can be reused for authentication within their validity period.\n- **Token injection attacks**: A malicious or compromised identity provider can inject tokens across sessions without detection.\n- Affects any Roadiz application using the `roadiz/openid` package with OpenID Connect SSO.\n\nThe OIDC Core 1.0 specification (Section 3.1.3.7) explicitly requires clients to verify the `nonce` claim if it was present in the authorization request.","published":"2026-05-08T21:54:32.715Z","modified":"2026-10-28T02:30:30.124584582Z","cvss":null,"epss":{"score":0.00152,"percentile":0.04914,"asOf":"2026-08-12"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"roadiz/openid","fixedVersion":"2.7.18"},{"ecosystem":"Packagist","name":"roadiz/openid","fixedVersion":"2.6.31"},{"ecosystem":"Packagist","name":"roadiz/openid","fixedVersion":"2.5.45"},{"ecosystem":"Packagist","name":"roadiz/openid","fixedVersion":"2.3.43"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42206.json"},{"type":"ADVISORY","url":"https://github.com/roadiz/core-bundle-dev-app/security/advisories/GHSA-3gx8-q682-38mx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42206"},{"type":"PACKAGE","url":"https://github.com/roadiz/core-bundle-dev-app"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:30.124584582Z"}}