CVE-2026-2780
CRITICAL severity · CVSS 9.8 · Improper privilege management
9.8CVSS CRITICAL
Summary
Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2026-13/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-15/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-16/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-17/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2007829