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CVE-2026-9903

Medium

Description

Insufficient validation of untrusted input in Site Isolation in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted MHTML page. (Chromium security severity: High)

SeverityMedium
CVSS5.0
Exploit probability—
ProductGoogle Chrome
PublishedMay 28, 2026
First seenMay 28, 2026
Weakness typeCWE-20Improper input validation

How to fix

Update
  • google chrome148.0.7778.216 or later

Affected products

ProductAffected versionsFixed in
google chromev < 148.0.7778.216148.0.7778.216

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