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CVE PROGRAM SOURCE RECORD8.1 High

CVE-2026-0877

Mitigation bypass in the DOM: Security component

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Firefox

  • 115.32 to ≤ 115.*unaffected
  • 140.7 to ≤ 140.*unaffected
  • 147 to ≤ *unaffected

Mozilla Thunderbird

  • 140.7 to ≤ 140.*unaffected
  • 147 to ≤ *unaffected

References