CVE-2024-6601: Mozilla Firefox

Medium severity, CVSS 4.7. EPSS: 0.4% chance of exploitation in the next 30 days.

A race condition could lead to a cross-origin container obtaining permissions of the top-level origin. This vulnerability affects Firefox < 128, Firefox ESR < 115.13, Thunderbird < 115.13, and Thunderbird < 128.

Affected products

• Mozilla Firefox: before 128.0 (fixed in 128.0)
• Mozilla Thunderbird: before 128.0 (fixed in 128.0)

Published 2024-07-09. Last modified 2026-06-17.