WordPress Mobile Builder Plugin Privilege Escalation via REST

The Mobile builder WordPress plugin through 1.4.2 does not properly restrict which user meta keys a logged-in user can update through one of its REST routes, allowing any user with a self-registered account, such as a customer, to grant themselves the administrator role.

Casky was already ahead

This CVE exploits attack patterns that Casky's 224matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The Mobile builder WordPress plugin through version 1.4.2 contains a critical privilege escalation vulnerability stemming from insufficient access controls on REST API endpoints. Specifically, the plugin fails to properly validate which user meta keys can be modified by authenticated users, enabling any logged-in account—including self-registered customers with minimal permissions—to arbitrarily update user metadata and assign themselves administrator privileges. This vulnerability affects any WordPress installation using the vulnerable plugin version, particularly those with open user registration, and allows complete compromise of site administration without requiring elevated credentials or external access.

Casky's threat detection framework identifies this attack pattern through MITRE ATT&CK technique TA0004 (Privilege Escalation), cross-referencing CWE-269 (Improper Access Control) patterns against 224 mapped security skills. When practitioners analyze their environment using Casky's Claude-powered detection, they would observe: unauthorized user meta modifications targeting admin role assignments, anomalous REST API calls from low-privilege accounts requesting elevated permissions, and sudden privilege level changes without corresponding administrative actions. The extended reasoning capabilities flag the specific attack chain—self-registration → REST endpoint abuse → metadata tampering → role escalation—allowing security teams to distinguish this CVE's signature from other privilege escalation attempts and implement targeted API validation controls on affected REST routes.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

224 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-103694.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004

Investigate the attack patterns behind CVE-2026-103694

Casky has 224 skills that investigate the attack patterns behind CVE-2026-103694. Run one and get CVSS-scored findings in 3 minutes.

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