Stored XSS in WordPress Anti-Spam Plugin Admin Panel

The Anti-Spam, Spam FireWall by CleanTalk WordPress plugin before 6.91 does not escape a commenter-supplied value before outputting it on an administrative spam-review screen, allowing unauthenticated users to inject arbitrary web scripts that execute in the browser of an administrator who reviews flagged comments.

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 CleanTalk Anti-Spam WordPress plugin before version 6.91 contains a stored cross-site scripting (XSS) vulnerability in its administrative spam review interface. The plugin fails to properly escape user-supplied commenter data before displaying it to administrators, allowing unauthenticated attackers to inject malicious JavaScript code. This code executes in the browser context of any administrator who views the flagged comments section, potentially compromising admin accounts and WordPress site integrity. With a CVSS score of 7.5, this vulnerability poses a significant risk to the thousands of WordPress sites using this plugin, as it requires no authentication to exploit and can lead to admin credential theft, plugin/theme installation, or site takeover.

Casky's 323 matching skills leverage Claude's extended reasoning to identify the attack patterns underlying this vulnerability across MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would detect this through skills that recognize improper input validation (CWE-79) patterns, such as monitoring for unescaped HTML/JavaScript injection points in plugin data flows. The platform's skills correlate stored XSS signatures with TA0001 tactics—identifying how unauthenticated comment injection serves as an initial access vector—and TA0043 reconnaissance activities where attackers probe admin interfaces. Security teams would surface findings showing comment data flowing directly to admin output without sanitization, enabling them to prioritize remediation before attackers weaponize the vulnerability for admin account compromise or malware deployment.

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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-2026-115673.

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-2026-115673

Casky has 323 skills that investigate the attack patterns behind CVE-2026-115673. Run one and get CVSS-scored findings in 3 minutes.

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