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CVE-2024-9398

MEDIUM
5.3
CVSS Score
Published: October 1, 2024 at 03:13 PM UTC
Updated: October 8, 2026 at 03:37 PM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application which implements that protocol handler is installed. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, 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 < 128.3.0v < 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
Thunderbird· Mozilla
95%
v < 128.3v < 131*129.0129.0 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
Firefox ESR· Mozilla
90%
v < 128.3
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

References (5)

Issue TrackingPermissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1881037
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/mfsa2024-49/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-50/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

5.3MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfoCWE-203

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