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Vulnerability details

CVE-2026-13447

inspireui MStore API – Create Native Android & iOS Apps On The Cloud

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

CVSS 3.1
9.8Critical

Official 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 scores

ScoreVersionSourceVector
9.8Critical 3.1 CVEProject cvelistV5 (CNA) (Wordfence) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
inspireui MStore API – Create Native Android & iOS Apps On The Cloud v ≤ 4.20.0 CVEProject cvelistV5 (CNA)

References and advisories

7
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Details

Published
2026-09-05
Last updated
2026-09-07
State
Published
Assigner (CNA)
Wordfence

Exploit prediction (EPSS)

0.69%
Probability of exploitation in 30 days
53%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-287
    Improper Authentication