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Critical · 9.8 Public exploit CVE-2026-13447 EUVD-2026-71838GHSA-6wfp-pwm3-667v

MStore API <= 4.20.0 - Unauthenticated Authentication Bypass via 'id_token' Parameter JWT Forgery

Published Sep 5, 2026 · Updated Sep 7, 2026 · Assigned by Wordfence

Vendor: inspireui Product: MStore API – Create Native Android & iOS Apps On The Cloud Platform: Android Platform: iOS Category: Web / CMS

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.

Affected products

VendorProductAffectedFixed
inspireui MStore API – Create Native Android & iOS Apps On The Cloud ≤ 4.20.0 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • abraxas/CVE-2026-13447 ★ 0 · Sep 19, 2026

    CVE-2026-13447 - WordPress - inspireui - Critical 9.8 - Unauthenticated POST /wp-json/api/flutter_user/firebase_sms_v2 - Authentication Bypass

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References