Unauthenticated Reflected XSS in Document Gallery WordPress Plugin

The Document Gallery WordPress plugin through 5.1.1 does not properly sanitise and escape user input before reflecting it inside an HTML attribute in the response of an unauthenticated AJAX action, leading to a Reflected Cross-Site Scripting vulnerability which can be exploited against any visitor, including a logged-in administrator.

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

The Document Gallery WordPress plugin contains a Reflected Cross-Site Scripting (CWE-79) vulnerability in an unauthenticated AJAX action that fails to properly sanitize and escape user input before reflecting it in HTML attributes. This high-severity vulnerability (CVSS 7.1) is particularly dangerous because it requires no authentication and can target any site visitor, including administrators with elevated privileges. WordPress plugins are frequent attack vectors due to their widespread deployment, and this vulnerability's unauthenticated nature makes it trivially exploitable at scale. Attackers can craft malicious URLs to inject arbitrary JavaScript that executes in victims' browsers, potentially leading to account compromise, credential theft, or malware distribution.

Casky's 323 mapped skills leverage Claude AI's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK's Initial Access (TA0001) and Reconnaissance (TA0043) techniques. Practitioners using Casky would observe detection findings that correlate suspicious AJAX parameter patterns with reflected output in HTML contexts—specifically identifying unescaped user input flowing into attribute values. The platform's skills would flag unauthenticated endpoints handling user-controlled data and trace how attackers perform reconnaissance by probing AJAX actions for injection points. By mapping to these ATT&CK techniques, Casky helps security teams understand that exploitation attempts appear as unusual query parameters in access logs and anomalous JavaScript execution patterns, enabling faster incident response and vulnerability prioritization in WordPress environments.

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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 →

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-2026-74920.

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

Investigate the attack patterns behind CVE-2026-74920

Casky has 323 skills that investigate the attack patterns behind CVE-2026-74920. Run one and get CVSS-scored findings in 3 minutes.

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