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Vulnerability record · CVE-2026-16379 · published 21 July 2026

CVE-2026-16379: Mozilla firefox improper privilege management vulnerability

Mozilla · Firefox

Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

8.8 CVSS 3.1 High EPSS 0.28% · top 81.9% CWE-269 · Improper privilege management
8.8CVSS 3.1 base score
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
5References
24 Jul 2026Last modified by NVD

Description

Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=2039452 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-68/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-70/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-71/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-72/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-16379), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.