CVE-2026-11253 Overview
CVE-2026-11253 is an inappropriate implementation vulnerability in the Permissions component of Google Chrome prior to version 149.0.7827.53. A remote attacker can leak cross-origin data by convincing a user to visit a crafted HTML page. The flaw breaks the same-origin protection model that browsers rely on to isolate content between websites.
The vulnerability requires user interaction and affects Chrome on Windows, macOS, and Linux. Google classified the Chromium security severity as Low, and the issue is tracked under [CWE-362] (Concurrent Execution using Shared Resource with Improper Synchronization, also known as Race Condition).
Critical Impact
A crafted HTML page can read data from a different origin, undermining browser isolation and enabling potential exposure of authenticated session information or private user content.
Affected Products
- Google Chrome versions prior to 149.0.7827.53
- Chrome desktop builds running on Microsoft Windows, Apple macOS, and Linux
- Chromium-based browsers that inherit the affected Permissions implementation
Discovery Timeline
- 2026-06-05 - CVE-2026-11253 published to NVD
- 2026-06-05 - Last updated in NVD database
- 2026-06 - Google publishes the Stable Channel Update for Desktop
Technical Details for CVE-2026-11253
Vulnerability Analysis
The vulnerability resides in Chrome's Permissions subsystem, which mediates access to APIs that expose data such as geolocation, clipboard, notifications, and device sensors. An inappropriate implementation in this subsystem allows a remote attacker to bypass intended cross-origin restrictions. The result is that a malicious page can observe or infer state belonging to another origin loaded in the same browser session.
The underlying weakness category, [CWE-362], indicates a race condition. State checks tied to permission prompts or origin attribution can be observed or manipulated before the browser finalizes the security decision. Because the attack requires only a network-reachable page and a single user click or navigation, exploitation is straightforward from an attacker-controlled site.
Impact is limited to confidentiality of cross-origin data. The flaw does not by itself enable code execution, sandbox escape, or modification of the target origin's content.
Root Cause
The Permissions code path fails to consistently enforce origin boundaries during permission state evaluation. Refer to the Chromium Issue Tracker Entry for the upstream defect record.
Attack Vector
The attacker hosts a crafted HTML page and lures a victim to load it. Through scripted interaction with the Permissions API, the page elicits responses that reveal information bound to a different origin, such as whether a permission was previously granted on another site.
No verified public exploit code is available for CVE-2026-11253. See the Chromium Issue Tracker Entry for technical details once the issue is unrestricted.
Detection Methods for CVE-2026-11253
Indicators of Compromise
- Chrome process versions reporting a build earlier than 149.0.7827.53 on managed endpoints
- Browser telemetry showing repeated, rapid calls to the Permissions API (navigator.permissions.query) from unfamiliar origins
- Outbound connections from user workstations to newly registered domains immediately after a click-through from email or chat
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag hosts running builds below 149.0.7827.53.
- Inspect web proxy and DNS logs for users visiting suspicious or recently registered domains delivering HTML payloads with heavy Permissions API usage.
- Correlate browser update events with vulnerability scanner output to confirm remediation coverage.
Monitoring Recommendations
- Enable enterprise reporting in Chrome Browser Cloud Management to track version drift in real time.
- Alert on endpoints where Chrome auto-update has been disabled through policy or registry modification.
- Watch for anomalous referrer chains where a low-reputation origin precedes navigation to authenticated SaaS applications.
How to Mitigate CVE-2026-11253
Immediate Actions Required
- Update Google Chrome to version 149.0.7827.53 or later on all Windows, macOS, and Linux endpoints.
- Restart Chrome processes after the update so the patched binary is loaded into memory.
- Verify that enterprise update policies are not pinning Chrome to an older channel or version.
Patch Information
Google addressed CVE-2026-11253 in the Stable channel release 149.0.7827.53. Details are available in the Google Chrome Update Announcement. Chromium-based browsers including Microsoft Edge, Brave, and Opera should be updated to versions that incorporate the upstream fix.
Workarounds
- Restrict browsing to trusted sites through enterprise URL allow-lists until patching is complete.
- Disable or tighten the Permissions API surface using the DefaultGeolocationSetting, DefaultNotificationsSetting, and related Chrome enterprise policies.
- Require user interaction prompts for permission requests and avoid blanket grants across origins.
# Verify installed Chrome version on Linux
google-chrome --version
# Verify installed Chrome version on macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version
# Verify installed Chrome version on Windows (PowerShell)
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
