CVE-2024-8383: Firefox normally asks for confirmation before asking the operating system to find an application to
Source GCVE Database
Not known to be exploited · CVSS 7.5 High.
Data as of 3 Nov 2026, 17:14 UTC
Thin evidence
One scorer or none| CISA-ADP | CVSS 3.1 | 7.5 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 3 Sep 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
Description
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.
References
- nvd.nist.gov/vuln/detail/CVE-2024-8383 (opens in a new tab)
- bugzilla.mozilla.org/show_bug.cgi?id=1908496 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2024/09/msg00012.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2024/09/msg00025.html (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-39 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-40 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-41 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-43 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-44 (opens in a new tab)