CVE-2026-15131 and is rated Medium severity with a CVSS score of 4.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Microsoft Security Response Center guidance
Vendor revision: Jul 28, 2026
Release Notes
Vendor-listed releases
150.0.4078.65
CISA KEVNot listedBased on the latest collected catalog
EPSS0.3%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-15131?
Inappropriate implementation in Navigation in Google Chrome prior to 150.0.7871.115 allowed a remote attacker to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)