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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-13447
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-05 06:17:09 UTC
Updated2026-09-05 06:17:09 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-287 | CWE-287 CWE-287 Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Inspireui MStore API Create Native Android IOS Apps On The Cloud affected 4.20.0 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/flutter-user.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/flutter-user.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/flutter-user.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/helpers/firebase-p... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/helpers/firebase-phone-a... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/flutter-user.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/4a1127af-74f6-4748-9aee-5a8c6... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: t4g0 (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-06-26T17:05:18.000ZVendor Notified
CNA2026-09-04T17:19:59.000ZDisclosed

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