CVE-2026-13447: The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in vulnerability
CVE-2026-13447 affects The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in up to, and including, 4.20.0 This is due to mis The Mstore Api plugin for WordPress. The available advisory information identifies up to,...
What happened
CVE-2026-13447 affects The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in up to, and including, 4 20 0 This is due to mis The Mstore Api plugin for WordPress. A security weakness in The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in is being tracked as CVE-2026-13447. CVE-2026-13447 currently carries a CRITICAL 9 8 severity signal in the retained vulnerability data.
The available advisory information identifies up to, and including, 4 20 0 This is due to mis The Mstore Api plugin for WordPress as affected versions. No exploitation flag is present in the retained CyberDeltaForce data at this time; that status can change as vendor and threat-intelligence reporting develops. An authentication weakness can let an attacker cross a security boundary without passing the identity checks that normally protect the affected function or service.
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 Googl. The flaw is described as a authentication weakness vulnerability.
Editorial note: this News Brief follows the available evidence and adds length only when additional facts or useful context are available. Where public reporting does not establish a specific victim sequence, CyberDeltaForce does not present one as fact.
What the reporting and advisory establish
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 Googl
CVE-2026-13447 currently carries a CRITICAL 9.8 severity signal in the retained vulnerability data.
No exploitation flag is present in the retained CyberDeltaForce data at this time; that status can change as vendor and threat-intelligence reporting develops.
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 Googl
A security weakness in The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in is being tracked as CVE-2026-13447. The available advisory information identifies up to, and including, 4.20.0 This is due to mis The Mstore Api plugin for WordPress as affected versions. The flaw is described as a authentication weakness vulnerability. An authentication weakness can let an attacker cross a security boundary without passing the identity checks that normally protect the affected function or service. The issue currently carries a CRITICAL 9.8 severity signal in the available reporting. There is no reported exploitation in the current available reporting, so the public picture at this point is a disclosed vulnerability with known exploitation conditions rather than a confirmed compromise of every affected installation.
What this means for your environment
Move from the published facts to the technical path, exposure conditions and defensive decisions that matter in a real environment.
Attack & Exploitation Path
The sequence below shows how the vulnerability can be reached and what successful exploitation can produce. Each stage is labeled by evidence status.
Required condition: The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in up to, and including, 4.20.0 This is due to mis The Mstore Api plugin for WordPress is present and the vulnerable function is reachable in the way the software is normally used.
Required condition: attacker-controlled input or the relevant workflow reaches the affected code path.
the reported authentication bypass is triggered inside The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in, crossing the security boundary described by the advisory or vulnerability record.
successful exploitation can bypass the authentication boundary described in the reporting and reach functionality that should require trusted access.
Map The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in up to, and including, 4.20.0 This is due to mis The Mstore Api plugin for WordPress to real assets, verify the vendor fix or mitigation, confirm the vulnerable path is no longer reachable, and review relevant telemetry for behavior consistent with exploitation.
Why this matters to you
CVE-2026-13447 matters because the practical risk is not the score alone — it is whether The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in up to, and including, 4 exists in your environment and whether the reported trigger or exposure path can reach it. The current severity is CRITICAL 9.8. No exploitation flag is currently present in the CDF data, but that does not remove the need to validate affected systems.
Does this deserve attention in my environment?
Check the conditions below against your use of The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in up to, and including, 4.
Select the conditions that are true in your environment. Leaving a condition unselected does not mean you are safe — it only means you have not marked it as applicable.
- Search endpoint, software and asset inventory for The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in up to, and including, 4.
- Confirm the vendor-recommended fixed version or mitigation and verify deployment, not just assignment, across affected assets.
- Review relevant endpoint, application, network or identity telemetry for activity associated with exploitation of the affected component.
- Track vendor and government guidance for any change in exploitation status while remediation is underway.
What remains unconfirmed
- Available reporting does not currently indicate exploitation, but that can change as vendor, government or threat-intelligence reporting develops.
Sources & References
Original reporting and technical references are kept here for readers who want to verify the facts. Publisher names stay out of the reading flow above.