CVE WatchJul 15, 2026

CVE-2026-0877

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

CVSS

8.1

High

EPSS

0.4%

p34

KEV

—

Exploit Today

0-100

Published: Jan 13, 2026 · Last modified: Jul 15, 2026 · CWE-693

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-06-302026-07-19

Technical 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.

Official references

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