jQuery Hover Footnotes Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the jQuery Hover Footnotes plugin for WordPress, affecting all versions through 1.4. The issue arises from inadequate input sanitization and output escaping, allowing authenticated attackers with author-level access or higher to inject arbitrary web scripts. These scripts execute when a user accesses the affected page. The vulnerability exploits the Footnote Qualifier syntax, bypassing WordPress's wp_kses_post() filtering by using attribute-breakout payloads that omit angle brackets.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user viewing the page.