CVE-2026-2777

CRITICAL
2026-02-24 [email protected]
9.8
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:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch Released
Apr 10, 2026 - 08:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 24, 2026 - 14:16 nvd
CRITICAL 9.8

Tags

Privilege Escalation Firefox Thunderbird Redhat Suse

Description

Privilege escalation in the Messaging System component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Analysis

Privilege escalation in Firefox Messaging System component before 148. The inter-process messaging system allows escalation from content to privileged process.

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Remediation

Within 24 hours: Inventory all Firefox and Thunderbird installations across the organization and communicate the vulnerability to end users. Within 7 days: Implement mandatory disable of the Messaging System component or restrict application usage to air-gapped environments pending patch availability; establish daily monitoring for patch release announcements from Mozilla. …

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Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +49
POC: 0

Vendor Status

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CVE-2026-2777 vulnerability details – vuln.today
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