VDB

CVE-2026-84134

CVE-2026-84134 PUBLISHED CVSS 9.8 CRITICAL

Reported by mozilla · Published September 1, 2026

Other issue in the Profile Backup component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

Risk Scores

CVSS 3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Products

VendorProductVersions
MozillaFirefox153.2, 155
MozillaThunderbird153.2, 155
MozillaFirefox155, 153.2, 155
chainguardfirefox0, 0
MozillaThunderbird153.2, 155, 153.2
wolfifirefox0, 0, 0

Timeline

  • Sep 1, 2026 Coalition ESS Score
  • Sep 1, 2026 CVE Published
  • Sep 2, 2026 EPSS Score
  • Sep 3, 2026 CVE Updated
  • Sep 4, 2026 EPSS Score
  • Sep 9, 2026 EPSS Score
  • Sep 12, 2026 EPSS Score
  • Sep 16, 2026 EPSS Score
  • Sep 18, 2026 EPSS Score

References

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