🔐 CVE Alert

CVE-2026-0881

CRITICAL 10.0

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 Apr 13, 2026
Stay Ahead of the Next One

Get instant alerts for mozilla firefox

Be the first to know when new critical vulnerabilities affecting mozilla firefox are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

Mozilla / Firefox
All versions affected
Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
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/

Credits

Andrew McCreight