VULNERABILITY INTELLIGENCE

CVE-2025-64295

CVSS score6.5 MEDIUM

EPSS probability0.36%

CISA KEVNot currently listed

Published2025-12-18

Last modified2026-06-17

Description

Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.