Nankeen

**Name of the Vulnerable Software and Affected Versions** reason-jose versions prior to 0.8.2 **Description** The issue affects the `Jose.Jws.validate` function, which does not check HS256 signatures. This allows tampering of JWS header and payload data if the service does not perform additional checks, potentially exposing applications to authorization bypass. Applications relying on JWS claims assertion to enforce security boundaries may be vulnerable to privilege escalation. **Recommendations** For versions prior to 0.8.2, update to version 0.8.2 to resolve the issue. As a temporary workaround, consider implementing additional checks for HS256 signatures to prevent tampering of JWS header and payload data. Restrict access to sensitive applications relying on JWS claims assertion to minimize the risk of exploitation.