Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does not support. It did not ask before doing so for the Usenet-related schemes news: and snews:. Since most operating systems don't have a trusted newsreader installed by default, an unscrupulous program that the user downloaded could register itself as a handler. The website that served the application download could then launch that application at will This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Firefox ESR < 115.15.

Mozilla Corporation https://bugzilla.mozilla.org/show_bug.cgi?id=1908496 [No types assigned]

Mozilla Corporation https://www.mozilla.org/security/advisories/mfsa2024-39/ [No types assigned]

Mozilla Corporation https://www.mozilla.org/security/advisories/mfsa2024-40/ [No types assigned]

Mozilla Corporation https://www.mozilla.org/security/advisories/mfsa2024-41/ [No types assigned]