Information Disclosure in Firefox Settings UI Component
CVE-2026-2803

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2803?

This vulnerability pertains to an information disclosure issue within the Settings UI component of Firefox, which allows unauthorized access to potentially sensitive data. Specifically, versions of Firefox prior to 148 are impacted, enabling attackers to bypass intended mitigations, thereby exposing user information. It is critical for users running affected versions to apply updates promptly to safeguard against potential exploitation.

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Affected Version(s)

Firefox < 148

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2012012
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-16/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Skywarp
JSON
.