MStore API <= 4.18.3 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary User Meta Update

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Summary

CVECVE-2026-3568
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-09 04:16:59 UTC
Updated2026-04-13 15:02:47 UTC
DescriptionThe MStore API plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 4.18.3. This is due to the update_user_profile() function in controllers/flutter-user.php processing the 'meta_data' JSON parameter without any allowlist, blocklist, or validation of meta keys. The function reads raw JSON from php://input (line 1012), decodes it (line 1013), authenticates the user via cookie validation (line 1015), and then directly iterates over the user-supplied meta_data array passing arbitrary keys and values to update_user_meta() (line 1080) with no sanitization or restrictions. This makes it possible for authenticated attackers, with Subscriber-level access and above, to modify arbitrary user meta fields on their own accounts, including sensitive fields like wp_user_level (to escalate to administrator-level legacy checks), plugin-specific authorization flags (e.g., _wpuf_user_active, aiowps_account_status), and billing/profile fields with unsanitized values (potentially enabling Stored XSS in admin contexts). Note that wp_capabilities cannot be directly exploited this way because it requires a serialized array value, but wp_user_level (a simple integer) and numerous plugin-specific meta keys are exploitable.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

EPSS: 0.000360000 probability, percentile 0.106310000 (date 2026-04-15)

Problem Types: CWE-639 | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Inspireui MStore API Create Native Android IOS Apps On The Cloud affected 4.18.3 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/changeset [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/trunk/controllers/flutter-user.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.3/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/4.18.3/controllers/flutter-user.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.3/controllers/flutter-user.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/a77bc126-4dbd-4a26-b98c-94634... [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: Osvaldo Noe Gonzalez Del Rio (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-05T01:27:28.000ZVendor Notified
CNA2026-04-08T00:00:00.000ZDisclosed
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