CVE-2025-6429Medium· 6.5▾ SunlitFirefox 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 t…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 35.8 · likelihood 0.1 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.4%
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.
firefox < 128.12.0firefox < 140.0Upgrade past the affected range:
firefox 140.0Connected by shared product, vendor, weakness, or advisory.
CVE-2023-29541High· 8.8Firefox did not properly handle downloads of files ending in <code>.desktop</code>, which can be interpreted to run attacker-controlled commands
CVE-2023-29543High· 8.8An attacker could have caused memory corruption and a potentially exploitable use-after-free of a pointer in a global object's debugger vector
CVE-2026-96869Medium· 4.3Information disclosure in the Networking component
CVE-2026-100832High· 8.8Use-after-free in the Graphics: Canvas2D component
CVE-2026-100831High· 8.8Use-after-free in the DOM: UI Events & Focus Handling component
CVE-2026-100830NoneMitigation bypass in the DOM: Navigation component