CVE-2025-9866

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)
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
8.8 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
ChromeCNA
---
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CISA-ADPADP
8.8 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 15%
VendorProductVersion
googlechrome
𝑥
< 140.0.7339.80
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
chromium
bullseye (security)
vulnerable
bullseye
vulnerable
bookworm
vulnerable
bookworm (security)
141.0.7390.107-1~deb12u1
fixed
trixie
vulnerable
trixie (security)
141.0.7390.107-1~deb13u1
fixed
forky
141.0.7390.107-1
fixed
sid
141.0.7390.107-1
fixed
Common Weakness Enumeration
References
https://chromereleases.googleblog.com/2025/09/stable-channel-update-for-desktop.html
https://issues.chromium.org/issues/379337758