WordPress Plugins Allow Authenticated XSS via Unvalidated Role Creation

The MDJM Event Management and Mobile Events Manager WordPress plugins through 1.7.8.7 do not check a capability or a nonce before creating a WordPress role from a name supplied in the request, and store that name without escaping it, allowing any authenticated user, such as a subscriber, to inject arbitrary web scripts which execute when an administrator opens one of the standard user management screens.

Casky was already ahead

This CVE exploits attack patterns that Casky's 323matched 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

CVE-2026-88801 represents a critical vulnerability in the MDJM Event Management and Mobile Events Manager WordPress plugins (versions through 1.7.8.7) that enables stored cross-site scripting (XSS) attacks through improper role creation. The vulnerability stems from three security failures: the absence of capability checks, missing nonce validation, and failure to escape user-supplied input before storage. Any authenticated user—even those with minimal subscriber privileges—can inject malicious JavaScript into WordPress role names, which then executes with administrative context when site administrators access user management screens. This affects any WordPress installation running these plugins, creating a pathway for privilege escalation, credential theft, and full site compromise through stored payload execution in high-trust administrative interfaces.

Casky's 323 matching skills leverage Claude's extended reasoning to detect the attack patterns underlying this vulnerability by analyzing MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners would observe detection signals across multiple dimensions: insufficient input validation patterns indicating CWE-79 vulnerability characteristics, suspicious role creation requests lacking proper authorization tokens, and malicious script payloads embedded in role nomenclature fields. The platform's skill mapping enables practitioners to correlate authentication bypass attempts (TA0001) with reconnaissance activities where attackers probe for administrative access points (TA0043), revealing the complete attack chain. In Casky findings, security teams would identify specific evidence such as role creation API calls from low-privilege accounts, stored XSS payloads in WordPress role metadata, and execution patterns triggering when administrative panels load—enabling rapid threat hunting and remediation before exploitation occurs.

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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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323 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-88801.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

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Casky has 323 skills that investigate the attack patterns behind CVE-2026-88801. Run one and get CVSS-scored findings in 3 minutes.

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