CVSS 3.1
10.0 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HCVE-2026-0881
Critical (10.0) in mozilla. EPSS 0.3% chance of exploitation in the next 30 days.
Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 28% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-284, CWE-693
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mozilla:firefox
- mozilla:thunderbird