CVE-2026-74935

Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Published 18 Aug 2026, 13:17 UTC Last modified 18 Aug 2026, 19:17 UTC

8.8

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

Attack profile

The conditions required to exploit this vulnerability and its potential impact.

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Scope Unchanged

Confidentiality High

Integrity High

Availability High

Exploitability2.8

Impact5.9

Affected products

Product applicability statements supplied with the NVD record.

NVD has not published structured affected-product data for this record.

Weakness classification

CWE categories help security teams group the underlying software weakness.

CWECWE-269

Source references

External advisories, patches and technical reports attached to this CVE record.

NVD National Vulnerability Database recordnvd.nist.gov 01 Technical reference security@mozilla.org 02 Technical reference security@mozilla.org 03 Technical reference security@mozilla.org 04 Technical reference security@mozilla.org 05 Technical reference security@mozilla.org 06 Technical reference security@mozilla.org 07 Technical reference security@mozilla.org 08 Technical reference security@mozilla.org