CVE-2026-92045

CRITICAL 9.6

Sandbox escape due to incorrect boundary conditions in the WebRTC component

CVSS Score

9.6

EPSS Score

0.2%

EPSS Percentile

5th

Sandbox escape due to incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Sep 15, 2026
Last Updated	Sep 21, 2026

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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=2054622 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-90/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-93/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-94/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-96/

Credits

Mozilla