vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2025-0237

WebChannel APIs susceptible to confused deputy attack

MEDIUM
5.4
CVSS Score
Published: January 7, 2025 at 04:07 PM UTC
Updated: October 5, 2026 at 03:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

Using Firefox by Mozilla?

Get instant alerts when new vulnerabilities affect Firefox - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM5.4
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

The WebChannel API, which is used to transport various information across processes, did not check the sending principal but rather accepted the principal being sent. This could have led to privilege escalation attacks. This vulnerability affects Firefox < 134, Firefox ESR < 128.6, Thunderbird < 134, and Thunderbird < 128.6.

Affected

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

Firefox· Mozilla
95%
v < 128.6.0v < 134.0
Vendor states this is fixed in 128.6 (unaffected)
Affected range stops below 128.6.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 134 (unaffected)
Affected range stops below 134.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 128.6.0129.0 ≤ v < 134.0
Vendor states this is fixed in 128.6 (unaffected)
Affected range stops below 128.6.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 134 (unaffected)
Affected range stops below 134.0, so it looks safe — our inference, not a vendor statement

References (6)

Issue TrackingPermissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1915257
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-01/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-02/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-04/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-05/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

5.4MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card