CVE-2021-24000: Mozilla Firefox

Low severity, CVSS 3.1. EPSS: 0.6% chance of exploitation in the next 30 days.

A race condition with requestPointerLock() and setTimeout() could have resulted in a user interacting with one tab when they believed they were on a separate tab. In conjunction with certain elements (such as &lt;input type="file"&gt;) this could have led to an attack where a user was confused about the origin of the webpage and potentially disclosed information they did not intend to. This vulnerability affects Firefox < 88.

Affected products

• Mozilla Firefox: before 88.0 (fixed in 88.0)

Published 2021-06-24. Last modified 2026-06-17.