CVE-2021-23955: Mozilla Firefox

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

The browser could have been confused into transferring a pointer lock state into another tab, which could have lead to clickjacking attacks. This vulnerability affects Firefox < 85.

Affected products

• Mozilla Firefox: before 85.0 (fixed in 85.0)

Published 2021-02-26. Last modified 2026-06-17.