WordPress Kubio Plugin Stored XSS via Unescaped Comments

The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 2.9.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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 Kubio AI Page Builder plugin for WordPress contains a stored cross-site scripting (XSS) vulnerability in versions up to 2.9.2, allowing unauthenticated attackers to inject malicious scripts through the 'comment' parameter. These injected scripts persist in the database and execute whenever any user visits the affected page, making this a particularly dangerous vulnerability. WordPress site administrators running this plugin are at immediate risk, as the attack requires no authentication and can compromise visitor sessions, steal credentials, or redirect users to malicious sites. With a CVSS score of 7.2, this represents a high-severity threat to any organization using the Kubio plugin on their web properties.

Casky's 323 mapped skills leverage Claude AI with extended reasoning to detect the attack patterns underlying this vulnerability across two critical MITRE ATT&CK techniques: TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky will surface detection findings related to injection attack signatures in HTTP request parameters, unusual script payloads in comment fields, and DOM-based payload analysis that identifies obfuscation techniques attackers use to bypass basic input filters. The platform's skills also correlate reconnaissance activity—probing for the Kubio plugin version and testing comment parameter handling—with exploitation attempts, helping security teams distinguish between casual scanning and active exploitation campaigns. Practitioners will see enriched findings that map observed malicious comments to CWE-79 patterns and recommend output escaping validation and Content Security Policy enforcement as immediate remediation steps.

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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-2026-100107.

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-2026-100107

Casky has 323 skills that investigate the attack patterns behind CVE-2026-100107. Run one and get CVSS-scored findings in 3 minutes.

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