Vulnerability 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)
CVSS Score
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Chrome | < 140.0.7339.80 |
Related Weaknesses (CWE)
References
- https://chromereleases.googleblog.com/2025/09/stable-channel-update-for-desktop.Release Notes
- https://issues.chromium.org/issues/379337758Issue TrackingPermissions Required
FAQ
What is CVE-2025-9866?
CVE-2025-9866 is a vulnerability with a CVSS score of 8.8 (HIGH). 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: Med...
How severe is CVE-2025-9866?
CVE-2025-9866 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-9866?
Check the references section above for vendor advisories and patch information. Affected products include: Google Chrome.