CVE-2026-13897: Google Chrome Privilege Escalation Flaw

CVE-2026-13897 Overview

CVE-2026-13897 is an insufficient policy enforcement vulnerability in the Chromecast component of Google Chrome. Versions of Chrome prior to 150.0.7871.47 are affected. A remote attacker can exploit this flaw by hosting a crafted HTML page and enticing a user to visit it. Successful exploitation results in privilege escalation within the browser context. The issue is tracked under CWE-284: Improper Access Control and carries a Chromium security severity rating of Medium.

Critical Impact
Remote attackers can achieve privilege escalation in Chrome via a crafted HTML page, requiring only a single user interaction such as visiting a malicious URL.

Affected Products

Google Chrome versions prior to 150.0.7871.47
Chromecast component within Google Chrome
Chromium-based browsers sharing the affected Chromecast integration

Discovery Timeline

2026-06-30 - CVE CVE-2026-13897 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-13897

Vulnerability Analysis

The vulnerability resides in Chrome's Chromecast integration, which handles media casting between the browser and Chromecast receivers. Insufficient policy enforcement in this component allows a remote web page to interact with Chromecast functionality in a manner that exceeds the intended security boundary. An attacker who convinces a user to load a crafted HTML page can leverage the flaw to escalate privileges within the browser, potentially bypassing origin restrictions that normally isolate untrusted web content from privileged browser features.

The classification maps to [CWE-284: Improper Access Control], indicating that access control checks in the Chromecast component are missing or incorrectly applied. The result is that untrusted origins can perform actions reserved for higher-privilege contexts.

Root Cause

The root cause is a failure to enforce policy checks on operations exposed through the Chromecast subsystem. Requests originating from a web page are not adequately validated against the security context permitted to interact with Chromecast APIs, enabling actions that should be restricted.

Attack Vector

Exploitation is remote and requires user interaction. The attacker delivers a crafted HTML page through phishing, malicious advertising, or a compromised website. When the victim loads the page in a vulnerable Chrome version, the embedded content triggers the Chromecast policy bypass. No authentication is required. Technical details are limited in the public advisory, and readers can consult the Chromium Issue Tracker Entry and the Google Chrome Release Update for additional context.

Detection Methods for CVE-2026-13897

Indicators of Compromise

Chrome browser processes running versions earlier than 150.0.7871.47 on managed endpoints.
Unexpected outbound connections from browser processes to Chromecast discovery endpoints on non-standard networks.
User reports of unsolicited casting prompts or media redirection after visiting unfamiliar web pages.

Detection Strategies

Inventory installed Chrome versions across the fleet and flag any build below 150.0.7871.47.
Monitor web proxy logs for URLs and referrers associated with pages that abuse Chromecast APIs.
Correlate browser telemetry with anomalous child process creation from chrome.exe following visits to untrusted domains.

Monitoring Recommendations

Enable endpoint telemetry that captures browser version, extension state, and command-line flags.
Track SSDP and mDNS traffic patterns that indicate Chromecast discovery attempts initiated by browser tabs.
Alert on Chrome auto-update failures, which can leave endpoints exposed to known browser flaws.

How to Mitigate CVE-2026-13897

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all managed endpoints.
Verify that Chrome's automatic update mechanism is enabled and functioning across the environment.
Restart the browser after patch deployment to ensure the fix is loaded into all Chrome processes.

Patch Information

Google addressed the flaw in the Stable channel release documented in the Google Chrome Release Update. Administrators should deploy Chrome 150.0.7871.47 or later through enterprise update channels such as Chrome Browser Cloud Management, Group Policy, or platform-native package managers.

Workarounds

Disable the Chromecast media router via the EnableMediaRouter enterprise policy where casting is not required.
Restrict outbound network access to Chromecast receivers on corporate networks using segmentation controls.
Apply URL allowlisting or Safe Browsing enterprise policies to reduce exposure to crafted HTML pages.

bash

# Configuration example: disable Chrome Media Router via policy on Linux
sudo mkdir -p /etc/opt/chrome/policies/managed
cat <<EOF | sudo tee /etc/opt/chrome/policies/managed/disable_cast.json
{
  "EnableMediaRouter": false,
  "ShowCastIconInToolbar": false
}
EOF