W3 Total Cache < 2.10.4 - Unauthenticated Stored XSS via Comment Author Name

Description

The plugin is vulnerable to Stored Cross-Site Scripting via the Comment Author Name, 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. Exploitation requires the Lazy Load Images feature to be enabled, as the unsafe re-emission occurs exclusively within the LazyLoad mutator's img tag rewriting step.