CVE-2024-8900: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

An attacker could write data to the user's clipboard, bypassing the user prompt, during a certain sequence of navigational events. This vulnerability affects Firefox < 129, Firefox ESR < 128.3, and Thunderbird < 128.3.

Affected products

• Mozilla Firefox: before 129.0 (fixed in 129.0)

Published 2024-09-17. Last modified 2026-06-17.