CVE-2026-0881
Sandbox escape in the Messaging System component
CVSS Score
10.0
EPSS Score
0.0%
EPSS Percentile
0th
Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Jan 13, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2005845 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-01/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-04/ access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-0881 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2428970 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0881.json
Credits
Andrew McCreight