CVE-2026-11155

chromium-browser: Insufficient policy enforcement in CSS

Published Jun 4, 2026 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Description

Inappropriate implementation in CSS in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)

Analysis

Technical impact

The vulnerability arises from insufficient policy enforcement in CSS parsing in Google Chrome versions prior to 149.0.7827.53. A malicious web page can provide specially crafted CSS rules that cause the browser to read data from a different origin, thereby leaking sensitive information. This flaw does not provide direct code execution but allows a remote attacker to observe cross‑origin data that normally would be inaccessible.

Affected Systems

All users running Google Chrome on Windows, macOS, or Linux with a stable‑channel version older than 149.0.7827.53 are susceptible. The issue is confined to the stable releases; other channels are unaffected according to the advisory.

Risk and Exploitability

Chromium classifies this issue as Medium, reflected by a CVSS score of 4.3, indicating a moderate severity level. The EPSS score is less than 1%, and the vulnerability is not listed in the CISA KEV catalog, suggesting no publicly known exploits. The likely attack vector is a user visiting a web page that hosts the crafted CSS; no elevated privileges or code execution are required to achieve the information disclosure.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Google

Chrome

affected

Version	Status	Constraints
`149.0.7827.53`	affected	< 149.0.7827.53

Configuration 1 [-]

AND

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*

OR	cpe:2.3:o:apple:macos:-:::::::*
	cpe:2.3:o:linux:linux_kernel:-:::::::*
	cpe:2.3:o:microsoft:windows:-:::::::*

No data.

Vendor Product Versions

Google

Chrome

Version	Status	Scheme	Platform
`[149.0.7827.53,149.0.7827.53)`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade Google Chrome to version 149.0.7827.53 or later
Enforce automatic updates for Chrome deployments to ensure the patched version is installed
Apply a content‑security policy that disallows loading external CSS from untrusted origins as a temporary mitigative measure
Verify that web applications handling state‑changing requests implement CSRF protections in accordance with CWE‑352 best practices

Generated by OpenCVE AI on June 7, 2026 at 16:02 UTC.

Tracking

Advisories

Source	ID	Title
Debian DSA	DSA-6325-1	chromium security update

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.164% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html
https://issues.chromium.org/issues/501801823
https://nvd.nist.gov/vuln/detail/CVE-2026-11155
https://www.cve.org/CVERecord?id=CVE-2026-11155

History

Jun 8, 2026 3:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Apple Apple macos Linux Linux linux Kernel Microsoft Microsoft windows
CPEs		cpe:2.3:a:google:chrome:::::::: cpe:2.3:o:apple:macos:-:::::::* cpe:2.3:o:linux:linux_kernel:-:::::::* cpe:2.3:o:microsoft:windows:-:::::::*
Vendors & Products		Apple Apple macos Linux Linux linux Kernel Microsoft Microsoft windows

Jun 7, 2026 12:15 PM Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Title	Chrome CSS Parsing Bug Enables Cross‑Origin Data Leakage	chromium-browser: Insufficient policy enforcement in CSS
Weaknesses		CWE-346
References		https://nvd.nist.gov/vuln/detail/CVE-2026-11155 https://www.cve.org/CVERecord?id=CVE-2026-11155
Metrics	threat_severity `None`	threat_severity `Moderate`

Jun 5, 2026 10:30 PM Title updated View changes

Type	Values Removed	Values Added
Title		Chrome CSS Parsing Bug Enables Cross‑Origin Data Leakage

Jun 5, 2026 8:15 PM Title updated. Weaknesses updated View changes

Type	Values Removed	Values Added
Title	Cross-Origin Data Leakage via Inadequate CSS Parsing in Google Chrome
Weaknesses	CWE-200

Jun 5, 2026 6:30 PM Weaknesses updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-352
Metrics		cvssV3_1 `{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jun 5, 2026 5:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Google Google chrome
Vendors & Products		Google Google chrome

Jun 5, 2026 4:15 AM Title updated. Weaknesses updated View changes

Type	Values Removed	Values Added
Title		Cross-Origin Data Leakage via Inadequate CSS Parsing in Google Chrome
Weaknesses		CWE-200

Jun 4, 2026 11:15 PM Description updated. Added references View changes

Type	Values Removed	Values Added
Description		Inappropriate implementation in CSS in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
References		https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html https://issues.chromium.org/issues/501801823