CVE-2026-87553

Improper input validation in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

  • Published Sep 9, 2026
  • CVSS 8.3 high
  • 0.4% chance of exploitation in the next 30 days (EPSS)
  • A fix is available

Affected software

CVE-2026-87553 at the National Vulnerability Database