PT-2026-21710 · Mozilla · Firefox Esr+2
Richard Belisle
·
Published
2026-01-01
·
Updated
2026-04-16
·
CVE-2026-2777
CVSS v3.1
9.8
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Firefox versions prior to 148
Firefox ESR versions prior to 115.33
Firefox ESR versions prior to 140.8
Thunderbird versions prior to 148
Thunderbird versions prior to 140.8
Description
A privilege escalation issue exists in the Messaging System component. This allows for unauthorized access and potential control over the system.
Recommendations
Update Firefox to version 148 or later.
Update Firefox ESR to version 115.33 or later.
Update Firefox ESR to version 140.8 or later.
Update Thunderbird to version 148 or later.
Update Thunderbird to version 140.8 or later.
Fix
LPE
Improper Privilege Management
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Weakness Enumeration
Related Identifiers
Affected Products
Firefox
Firefox Esr
Thunderbird