CyberRota Analysis
AI-GeneratedA site isolation vulnerability in the CSS Parsing and Computation component of Firefox could potentially allow attackers to access sensitive data from different sites. Users of affected versions prior to Firefox 154 and Firefox ESR 153.1 should prioritize updating their browsers to mitigate the risk of data exposure. Organizations relying on Firefox for secure browsing should ensure their deployments are up to date to protect against this issue.
CVE
CVE-2026-74986
Severity
CRITICAL
CVSS
9.1
EPSS
0.32%
Firefox
Original NVD 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.
Related CVEs
Other vulnerabilities affecting the same vendor(s)