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Vulnerability record · CVE-2026-74971 · published 18 August 2026

CVE-2026-74971: Mozilla firefox information exposure vulnerability

Mozilla · Firefox

Information disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

4.3 CVSS 3.1 Medium EPSS 0.35% · top 74.5% CWE-200 · Information exposure
4.3CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
7References
19 Aug 2026Last modified by NVD

Description

Information disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

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

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=2057204 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-74/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-76/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-77/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-78/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-79/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-80/ Vendor Advisory

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

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Source: NIST National Vulnerability Database (record CVE-2026-74971), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.