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Critical severity10.0NVD Advisory· Published Jan 13, 2026· Updated Apr 13, 2026

CVE-2026-0881

CVE-2026-0881

Description

Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

Affected products

2

Mozilla Corporation/Firefox
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Range: <147.0
Mozilla Corporation/Thunderbird
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
Range: <147.0

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

3

www.mozilla.org/security/advisories/mfsa2026-01/nvdVendor Advisory
www.mozilla.org/security/advisories/mfsa2026-04/nvdVendor Advisory
bugzilla.mozilla.org/show_bug.cginvdPermissions Required

News mentions

0

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