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CVE-2025-14331

Same-origin policy bypass in the Request Handling component

MEDIUM
6.5
CVSS Score
Published: December 9, 2025 at 01:38 PM UTC
Updated: October 7, 2026 at 08:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Same-origin policy bypass in the Request Handling component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6.

Affected

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

Firefox· Mozilla
95%
v < 115.31.0v < 146.0116.0 ≤ v < 140.6.0
Vendor states this is fixed in 115.31 (unaffected)
Affected range stops below 115.31.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 140.6 (unaffected)
Affected range stops below 140.6.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 146 (unaffected)
Affected range stops below 146.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 140.6.0v < 146.0
Vendor states this is fixed in 140.6 (unaffected)
Affected range stops below 140.6.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 146 (unaffected)
Affected range stops below 146.0, so it looks safe — our inference, not a vendor statement

References (6)

Issue TrackingPermissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2000218
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2025-92/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2025-93/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2025-94/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2025-95/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2025-96/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

6.5MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-346

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