CVE-2026-9903

EUVD-2026-33198
Insufficient validation of untrusted input in Site Isolation in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted MHTML page. (Chromium security severity: High)
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 5%
Affected Products (NVD)
VendorProductVersion
googlechrome
𝑥
< 148.0.7778.216
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
chromium
bookworm
150.0.7871.100-1~deb12u1
fixed
bookworm (security)
150.0.7871.114-1~deb12u1
fixed
bullseye
vulnerable
bullseye (security)
vulnerable
forky
150.0.7871.114-1
fixed
sid
150.0.7871.114-1
fixed
trixie
150.0.7871.100-1~deb13u1
fixed
trixie (security)
150.0.7871.114-1~deb13u1
fixed
Common Weakness Enumeration
References
https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
https://issues.chromium.org/issues/498783665