Published Nov 11, 2026Sources checked Nov 13, 2026
4.3MEDIUMCVSS out of 10
What this means
Review the available evidence
CVE-2026-126878 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: Nov 13, 2026
Release Notes
Vendor-listed releases
157.0.4341.57
CISA KEVNot listedBased on the latest collected catalog
EPSS0.2%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-126878?
Information leak in Core in Google Chrome prior to 157.0.8103.78 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)