CVE-2026-2803

HIGH
2026-02-24 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Patch Released
Apr 10, 2026 - 14:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 24, 2026 - 14:16 nvd
HIGH 7.5

Tags

Information Disclosure Firefox Thunderbird Redhat Suse

Description

Information disclosure, mitigation bypass in the Settings UI component. This vulnerability affects Firefox < 148 and Thunderbird < 148.

Analysis

The Settings UI component in Firefox and Thunderbird versions prior to 148 fails to properly restrict access to sensitive configuration data, enabling unauthenticated attackers to remotely disclose confidential information without user interaction. This vulnerability bypasses existing security mitigations designed to protect user settings and preferences. …

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Remediation

Within 24 hours: Inventory all Firefox and Thunderbird installations across the organization and restrict access to Settings UI where possible. Within 7 days: Disable or restrict non-essential features in the Settings component; implement user awareness training on avoiding suspicious configuration changes. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +38
POC: 0

Vendor Status

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CVE-2026-2803 vulnerability details – vuln.today
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