CVE-2026-4692CRITICAL 10.0EPSS p30.6%

CVE-2026-4692CVE-2026-4692

Description

Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Scoring

CVSS 3.110.0 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS0.39% probability of exploitation · percentile 30.6% · 2026-06-19T12:03:05Z
Published2026-03-24
Last modified2026-04-13

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2017643
  2. https://www.mozilla.org/security/advisories/mfsa2026-20/
  3. https://www.mozilla.org/security/advisories/mfsa2026-21/
  4. https://www.mozilla.org/security/advisories/mfsa2026-22/
  5. https://www.mozilla.org/security/advisories/mfsa2026-23/
  6. https://www.mozilla.org/security/advisories/mfsa2026-24/

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.