CVE-2026-0877HIGH 8.1EPSS p22.7%

CVE-2026-0877CVE-2026-0877

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.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS0.31% probability of exploitation · percentile 22.7% · 2026-06-19T12:03:05Z
Published2026-01-13
Last modified2026-04-13

Underlying weaknesses· 1

CWE-693

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1999257
  2. https://www.mozilla.org/security/advisories/mfsa2026-01/
  3. https://www.mozilla.org/security/advisories/mfsa2026-02/
  4. https://www.mozilla.org/security/advisories/mfsa2026-03/
  5. https://www.mozilla.org/security/advisories/mfsa2026-04/
  6. https://www.mozilla.org/security/advisories/mfsa2026-05/

1

TypeTargetConfidenceTier
WeaknessProtection Mechanism Failurecwe-6930%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
CVE-2026-2784
CVE
CVE-2026-8962
CVE
CVE-2026-6771
CVE
CVE-2025-13018
CVE
CVE-2026-2775
CVE
CVE-2026-8969
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.