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CVE-2024-9394

HIGH
7.5
CVSS Score
Published: October 1, 2024 at 03:13 PM UTC
Updated: June 17, 2026 at 08:24 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 131v < 131.0
Affected range stops below 131, so it looks safe — our inference, not a vendor statement
Affected range stops below 131.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 115.16v < 115.16.0v < 128.3116.0 ≤ v < 128.3.0
Affected range stops below 115.16, so it looks safe — our inference, not a vendor statement
Affected range stops below 115.16.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 128.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 128.3.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 128.3v < 131129.0 beta129.0 beta2129.0 beta3129.0 beta4129.0 beta5129.0 beta6
Affected range stops below 128.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 131, so it looks safe — our inference, not a vendor statement

References (8)

Permissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1918874
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-46/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-47/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-48/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-49/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-50/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/10/msg00004.html
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/10/msg00006.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-OtherCWE-79

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