CVE-2023-25736: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

An invalid downcast from `nsHTMLDocument` to `nsIContent` could have lead to undefined behavior. This vulnerability affects Firefox < 110.

Affected products

• Mozilla Firefox: before 110.0 (fixed in 110.0)

Published 2023-06-19. Last modified 2026-06-17.