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CVE-2026-74986

nvd nist
Published: Aug 18, 2026Modified: Aug 25, 2026

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9.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Exploitability: 3.9 / Impact: 5.2
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

Site isolation issue in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Affected (2)

Mozilla
2 products
Firefox
Thunderbird
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Firefox
Before 153.1.0
Thunderbird
Before 153.1.0

Related CWEs

CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

References (5)

Source: security@mozilla.org
Permissions Required
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory

Timeline

No history available yet.