🛡️ CVE-2024-9394 — firefox

🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-79 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the resource://devtools origin. This could allow them to access cross-origin JSON content. This access is limited to "same site" documents by the Site Isolation feature on desktop clients, but full cross-origin access is possible on Android versions. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Firefox ESR < 115.16, Thunderbird < 128.3, and Thunderbird < 131.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2024-9394 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2024-9394 is recorded against 3 packages.

  • firefox (fixed in 131.0)
  • firefox-esr (from 116.0 up to 128.3.0)
  • thunderbird

Timeline and source

Published on 1 October 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

bugzilla.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
lists.debian.org
lists.debian.org

CVE-2024-9394 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2024-10-01
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
firefox — 131.0
firefox-esr 116.0 128.3.0
thunderbird — —

Similar Threats

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