CVE-2025-9180: Mozilla Firefox

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Same-origin policy bypass in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

Affected products

• Mozilla Firefox: before 115.27.0 (fixed in 115.27.0); before 142.0 (fixed in 142.0); from 128.0, before 128.14.0 (fixed in 128.14.0); from 140.0, before 140.2.0 (fixed in 140.2.0)
• Mozilla Thunderbird: before 128.14.0 (fixed in 128.14.0); before 142.0 (fixed in 142.0); from 140.0, before 140.2.0 (fixed in 140.2.0)

Published 2025-08-19. Last modified 2026-10-05.