CVE-2026-42206: Roadiz/openid OpenID Connect Nonce Generated But Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3gx8-q682-38mx",
  "modified" : "2026-05-13T13:38:01Z",
  "published" : "2026-04-29T20:51:40Z",
  "aliases" : [ "CVE-2026-42206" ],
  "summary" : "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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "roadiz/openid"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.7.0"
      }, {
        "fixed" : "2.7.18"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "roadiz/openid"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.6.0"
      }, {
        "fixed" : "2.6.31"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "roadiz/openid"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.5.0"
      }, {
        "fixed" : "2.5.45"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "roadiz/openid"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.43"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-345" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-29T20:51:40Z",
    "nvd_published_at" : "2026-05-08T22:16:31Z"
  }
}