Magee Shortcodes Plugin Reflects Unescaped User Input via AJAX

The Magee Shortcodes WordPress plugin through 2.1.1 does not sanitise and escape user input in some of its AJAX actions, which are available to unauthenticated users, before reflecting it back in the response, leading to Reflected Cross-Site Scripting.

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 Magee Shortcodes WordPress plugin through version 2.1.1 contains a Reflected Cross-Site Scripting (XSS) vulnerability in its AJAX handlers that accept unauthenticated user input without proper sanitization or escaping. This vulnerability is particularly concerning because AJAX endpoints are often overlooked in security reviews, and their availability to unauthenticated users dramatically expands the attack surface. WordPress sites using this plugin are vulnerable to attackers crafting malicious URLs that, when clicked by administrators or users, can execute arbitrary JavaScript in their browsers—potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of compromised accounts.

Casky's 323 matching security skills leverage Claude AI's extended reasoning to detect this attack pattern by mapping to MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would identify findings showing how attackers probe AJAX endpoints for input reflection, craft payloads that bypass weak or missing output encoding, and deliver those payloads through social engineering or watering hole attacks. The platform's skill coverage helps security teams recognize the reconnaissance phase where attackers enumerate plugin versions and AJAX action names, followed by the exploitation phase where reflected XSS payloads are injected. By correlating CWE-79 patterns with WordPress-specific behavioral indicators, Casky enables practitioners to detect both active exploitation attempts and the vulnerable code patterns in their plugin inventory before attacks occur.

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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-2026-105316.

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-2026-105316

Casky has 323 skills that investigate the attack patterns behind CVE-2026-105316. Run one and get CVSS-scored findings in 3 minutes.

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