CVE-2021-32821: Mootools

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

MooTools is a collection of JavaScript utilities for JavaScript developers. All known versions include a CSS selector parser that is vulnerable to Regular Expression Denial of Service (ReDoS). An attack requires that an attacker can inject a string into a CSS selector at runtime, which is quite common with e.g. jQuery CSS selectors. No patches are available for this issue.

Affected products

• Mootools Mootools: up to and including 1.6.0

Published 2023-01-03. Last modified 2026-06-17.