CVE-2026-0877highCWE-693

CVE-2026-0877: high-severity vulnerability in Mozilla Firefox

Mitigation bypass in the DOM: Security component

Published · Updated

Follow this CVE+ Monitor Firefox+ Monitor Thunderbird

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.1epss 0.5%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Affected products
Mozilla · FirefoxMozilla · Thunderbird
Related CVEs — Mozilla Firefox

In the same product, most dangerous first.

CVE-2016-9079HIGHCVE-2016-9079EPSS 87.4%KEVCVE-2019-11708CRITICALCVE-2019-11708EPSS 55.9%KEVCVE-2019-17026HIGHCVE-2019-17026EPSS 46.3%KEVCVE-2019-11707HIGHCVE-2019-11707EPSS 38.0%KEVCVE-2024-9680CRITICALCVE-2024-9680EPSS 23.2%KEVCVE-2022-26485HIGHCVE-2022-26485EPSS 14.3%KEV