CVE-2023-25746: Mozilla Firefox ESR

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Memory safety bugs present in Firefox ESR 102.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 102.8 and Firefox ESR < 102.8.

Affected products

• Mozilla Firefox ESR: before 102.8 (fixed in 102.8)
• Mozilla Thunderbird: before 102.8 (fixed in 102.8)

Published 2023-06-02. Last modified 2026-06-17.