CVE-2026-9903

MEDIUM EPSS 5.7%

Published May 28, 20261mo ago · Modified Jun 17, 20261w ago

5.0 CVSS 3.1

Medium

Published May 28, 2026 1mo ago

Last Modified Jun 17, 2026 1w ago

Description

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)

CVSS Details

Base Score

5.0

Exploitability

1.6

Impact

3.4

Vector string

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

Attack Vector Network

Attack Complexity High

Privileges Required None

User Interaction Required

Scope Unchanged

Confidentiality Low

Integrity Low

Availability Low

Threat Intelligence

EPSS Exploit Probability

5.7% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-20 Improper Input Validation Validation

Affected Products 1

Vendor	Product	Version	Range
google	chrome	*	<148.0.7778.216

References 2

chromereleases.googleblog.com https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html

Release Notes
issues.chromium.org https://issues.chromium.org/issues/498783665

Permissions Required

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.