CVE-2024-9394

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
Mozilla	Firefox	>= unspecified, < 131
Mozilla	Firefox ESR	>= unspecified, < 128.3
Mozilla	Firefox ESR	>= unspecified, < 115.16
Mozilla	Thunderbird	>= unspecified, < 128.3
Mozilla	Thunderbird	>= unspecified, < 131

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1918874Permissions Required
https://www.mozilla.org/security/advisories/mfsa2024-46/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-47/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-48/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-49/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-50/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/10/msg00004.html
https://lists.debian.org/debian-lts-announce/2024/10/msg00006.html

Timeline

Published: Oct 1, 2024
Last modified: Jun 17, 2026
NVD status: Modified

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