CVE-2026-8401CRITICAL 9.8EPSS p23.8%

CVE-2026-8401CVE-2026-8401

mozilla / firefox

Description

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.31% probability of exploitation · percentile 23.8% · 2026-08-03T12:00:16Z
Published2026-05-12
Last modified2026-07-15

Underlying weaknesses· 1

CWE-693

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=2038679
  2. https://www.mozilla.org/security/advisories/mfsa2026-45/
  3. https://www.mozilla.org/security/advisories/mfsa2026-47/
  4. https://www.mozilla.org/security/advisories/mfsa2026-48/
  5. https://www.mozilla.org/security/advisories/mfsa2026-51/

1

TypeTargetConfidenceTier
WeaknessProtection Mechanism Failurecwe-6930%live

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