🔐 CVE Alert

CVE-2026-84126

MEDIUM 4.3

Incorrect boundary conditions in the Layout: Grid component

CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th

Incorrect boundary conditions in the Layout: Grid component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

Vendor mozilla
Product firefox
Ecosystems
Industries
Technology
Published Sep 1, 2026
Last Updated Sep 1, 2026
Stay Ahead of the Next One

Get instant alerts for mozilla firefox

Be the first to know when new medium 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=2063893 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-82/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-86/

Credits

Irvan Kurniawan