Vulnerability Description
The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in versions up to, and including, 4.20.0 This is due to missing cryptographic signature verification in the FirebasePhoneAuthHelper::verify_id_token() function, which decodes and validates Firebase ID token claims (alg, kid, aud, iss) but never calls openssl_verify() or any equivalent to validate the JWT signature against Google's actual public key certificates. This makes it possible for unauthenticated attackers to forge a Firebase Phone Auth JWT signed with a self-generated RSA key pair and impersonate any phone number, resulting in unauthorized access to existing WordPress accounts or creation of new arbitrary accounts.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/fl
- https://plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/fl
- https://plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/he
- https://plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/flutter-
- https://plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/flutter-
- https://plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/helpers/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/4a1127af-74f6-4748-9ae
FAQ
What is CVE-2026-13447?
CVE-2026-13447 is a vulnerability with a CVSS score of 9.8 (CRITICAL). The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in versions up to, and including, 4.20.0 This is due to missing cryptographic signature verification in the F...
How severe is CVE-2026-13447?
CVE-2026-13447 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-13447?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.