CVE-2025-6429 — Incorrect parsing of URLs could have allowed embedding of youtube.com
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 securi…
Published: 2025-06-24 · CVSS: 6.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7