CVE-2025-9866

8.8 highEPSS 0.5%

High (8.8) in google chrome. EPSS 0.5% chance of exploitation in the next 30 days.

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)

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
CWE: CWE-693
Published: 2025-09-03
Modified: 2026-09-26
Record from: the NVD, synced 2026-10-19

Affected

google:chrome

References

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

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