CVE-2026-109234highCWE-79

CVE-2026-109234: high-severity vulnerability in tigroumeow Meow Lightbox

Meow Lightbox <= 5.6.4 - Unauthenticated Stored Cross-Site Scripting via HTML Parser Quote-Metadata Desynchronization

Published 31 Oct 2026 · Updated 01 Nov 2026

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.2epss 0.4%

The Meow Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'post_content (bbPress reply body)' parameter in all versions up to, and including, 5.6.4 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 requires the administrator to have enabled Output Buffering, the HtmlDomParser engine, and Aggressive Resolve, as well as a stored-HTML submission surface (such as bbPress anonymous replies) whose kses allow-list preserves img attributes; given these preconditions, a one-shot unauthenticated submission can execute arbitrary JavaScript in the context of any user who views the affected page.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected products

tigroumeow · Meow Lightbox

Related CVEs — tigroumeow Meow Lightbox

In the same product, most dangerous first.

CVE-2026-107756MEDIUMMeow Lightbox <= 5.6.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Output Buffering parser noise substitution via comment body + display_nameEPSS 0.3%

References