CVE-2025-9866

State: Published
Severity: 8.8 High
Published: Sep 3, 2025
Updated: Feb 26, 2026
Reserved: Sep 2, 2025

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)

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-693 Protection Mechanism Failure

Affected Products

Product	Versions
ChromeGoogle	140.0.7339.80 to before 140.0.7339.80Affected

References

https://chromereleases.googleblog.com/2025/09/stable-channel-update-for-desktop.html
https://issues.chromium.org/issues/379337758

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