CVE-2026-0881

EUVD-2026-2087
Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mozillaCNA
10 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 26.78%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mozillafirefox
𝑥
< 147.0
CNA
mozillathunderbird
𝑥
< 147.0
CNA
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
157.0.1-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
jammy
not-affected
noble
not-affected
plucky
not-affected
questing
not-affected
thunderbird
jammy
not-affected
noble
not-affected
plucky
not-affected
questing
not-affected
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2005845
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-04/
https://access.redhat.com/security/cve/CVE-2026-0881
https://bugzilla.redhat.com/show_bug.cgi?id=2428970
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0881.json