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CVE-2025-9866

High

Description

Inappropriate implementation in Extensions in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Medium)

SeverityHigh
CVSS8.8
Exploit probability—
ProductGoogle Chrome
PublishedSep 3, 2025
First seenSep 3, 2025
Weakness typeCWE-693CWE-693

How to fix

Update
  • google chrome140.0.7339.80 or later

Affected products

ProductAffected versionsFixed in
google chromev < 140.0.7339.80140.0.7339.80

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