Critical severity10.0NVD Advisory· Published Jan 13, 2026· Updated Jul 15, 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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
9cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <147.0
- (no CPE)range: <147
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*range: <147.0
- (no CPE)range: <147
- osv-coords5 versionspkg:apk/chainguard/firefoxpkg:apk/chainguard/firefox-esrpkg:apk/wolfi/firefoxpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed
< 147-r0+ 4 more
- (no CPE)range: < 147-r0
- (no CPE)range: < 0
- (no CPE)range: < 147-r0
- (no CPE)range: < 147.0-1.1
- (no CPE)range: < 153.0-1.1
Patches
Vulnerability mechanics
References
6- 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
- access.redhat.com/security/cve/CVE-2026-0881nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0881.jsonnvd
News mentions
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