The Mobile builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.4.2 via the…
CVE-2026-104799
The Mobile builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.4.2 via the wcfmmpprofilesettings() REST handler exposed at POST /mobile-builder/v1/wcfm-profile-settings. This is due to a PHP loose-comparison logic flaw in the meta key allow-list check — strpos( $key, 'mobilebuilder' ) == 0 evaluates to true for any key that does not contain the substring 'mobilebuilder' because strpos() returns false on no match and false == 0 is true in PHP — combined with a permissioncallback (userpermissionscheck) that grants access to any authenticated user by only verifying $user->exists(). This makes it possible for authenticated attackers, with Subscriber-level access and above, to pass an unsanitized data array via the key and data parameters directly to updateusermeta(), overwriting arbitrary user meta on their own account — including the wpcapabilities meta key — to grant themselves Administrator-level privileges.
Assessment
- CVSS
- 8.8 (v3.1)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 4 November 2026
- Last updated
- 4 November 2026
- Affected
- rnlab · Mobile builder
- Assigner
- Wordfence
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
At the source
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/bc1a233e-ea62-4fb0-98eb-6b2aa893555d?source=cve
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L94
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L93
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L344
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L78
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L87
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L88
- https://nvd.nist.gov/vuln/detail/CVE-2026-104799
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