WordPress 10Web Booster Plugin Stored XSS via Author Parameter

The 10Web Booster – Website speed optimization, Cache & Page Speed optimizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'author' parameter in all versions up to, and including, 2.34.8 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. This is exploitable because a comment author Name value containing ' src=' and an event-handler payload contains no HTML tags or quote characters, allowing it to survive WordPress core's sanitize_text_field and land verbatim inside the alt attribute, where the plugin's own str_replace subsequently injects the single quote that breaks out of the attribute context.

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-2026-107742 is a stored cross-site scripting (XSS) vulnerability in the 10Web Booster WordPress plugin affecting versions up to 2.34.8. The vulnerability exists in the 'author' parameter due to insufficient input sanitization and output escaping, allowing unauthenticated attackers to inject malicious JavaScript that persists in the application and executes whenever users access affected pages. This is particularly dangerous because the injected payload becomes permanent, affecting all users who view the compromised content—not just the attacker. Organizations using this popular caching and speed optimization plugin are at risk, especially if they allow public comments or user-generated content without strict validation. The CVSS score of 7.2 reflects the high severity, combining the broad attack surface (unauthenticated access) with meaningful impact potential.

Casky's 754 security skills, powered by Claude AI with extended reasoning, detect this attack pattern by mapping it to MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would identify suspicious findings showing malicious script injection through comment metadata, detection of unescaped user input flowing into DOM contexts, and patterns of JavaScript execution originating from stored comment fields. The platform's skills would flag insufficient output encoding in the author field rendering, correlate this with typical XSS payload patterns, and alert on the ability to inject payloads without authentication. Practitioners would see findings highlighting the gap between user input acceptance and secure output handling, enabling them to prioritize patching to version 2.34.9 or later and implement additional input validation layers across their WordPress installations.

Live Threat IntelligenceComing soon

Casky Risk Score

—

EPSS Probability

—

Shodan Exposure

—

GreyNoise Signal

—

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-2026-107742.

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-2026-107742

Casky has 323 skills that investigate the attack patterns behind CVE-2026-107742. Run one and get CVSS-scored findings in 3 minutes.

Run the skill that detects this →

X Instagram LinkedIn