CVE-2021-24436: Boldgrid w3 Total Cache

Medium severity, CVSS 6.1. EPSS: 1.9% chance of exploitation in the next 30 days.

The W3 Total Cache WordPress plugin before 2.1.4 was vulnerable to a reflected Cross-Site Scripting (XSS) security vulnerability within the "extension" parameter in the Extensions dashboard, which is output in an attribute without being escaped first. This could allow an attacker, who can convince an authenticated admin into clicking a link, to run malicious JavaScript within the user's web browser, which could lead to full site compromise.

Affected products

• Boldgrid w3 Total Cache: before 2.1.4 (fixed in 2.1.4)

Published 2021-07-19. Last modified 2026-06-17.