CVE-2025-11710: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

A compromised web process using malicious IPC messages could have caused the privileged browser process to reveal blocks of its memory to the compromised process. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

Affected products

• Mozilla Firefox: before 115.29.0 (fixed in 115.29.0); before 144.0 (fixed in 144.0); from 116.0, before 140.4.0 (fixed in 140.4.0)
• Mozilla Thunderbird: before 140.4.0 (fixed in 140.4.0); from 141.0, before 144.0 (fixed in 144.0)

Published 2025-10-14. Last modified 2026-06-17.