CVE-2026-13806: Google Chrome Auth Bypass Vulnerability

CVE-2026-13806 Overview

CVE-2026-13806 is a high-severity input validation vulnerability in the Accessibility component of Google Chrome. Versions prior to 150.0.7871.47 fail to properly validate untrusted input, enabling a remote attacker who has already compromised the renderer process to bypass site isolation using a crafted HTML page. Site isolation is a core Chrome security boundary that separates cross-origin content into distinct processes. Bypassing it lets an attacker access data from other sites loaded in the browser. Google assigned the issue a Chromium security severity of High and addressed it in the stable channel update for desktop.

Critical Impact
An attacker who controls a compromised renderer can bypass Chrome's site isolation boundary and access cross-origin data through a crafted HTML page.

Affected Products

Google Chrome versions prior to 150.0.7871.47
Chromium-based desktop builds using the vulnerable Accessibility component
All operating systems running affected Chrome stable channel releases

Discovery Timeline

2026-06-30 - CVE-2026-13806 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-13806

Vulnerability Analysis

The flaw resides in Chrome's Accessibility subsystem, which builds and exposes an accessibility tree derived from renderer content. The component does not sufficiently validate untrusted input passed from the renderer process to trusted browser-side handlers. When a compromised renderer supplies crafted accessibility data, the browser process treats it as legitimate. This allows the attacker to reach across the site isolation boundary that normally confines each origin to its own process. The result is unauthorized access to cross-origin content and state within the same browser instance. The weakness is classified as [CWE-20] Improper Input Validation.

Root Cause

Renderer-supplied accessibility structures cross a trust boundary into the browser process without adequate sanitization. Site isolation depends on the browser process rejecting malformed or unexpected data from any renderer. The Accessibility code path accepted crafted values that should have been rejected, breaking that assumption.

Attack Vector

Exploitation requires two stages. The attacker must first compromise the renderer process, typically through a separate memory corruption or logic bug triggered by malicious web content. The attacker then delivers a crafted HTML page that drives the Accessibility pathway to escape the renderer sandbox boundary enforced by site isolation. User interaction is required, consistent with a victim loading attacker-controlled content. No verified public proof-of-concept code is available for CVE-2026-13806.

See the Chromium Issue Tracker Entry and the Google Chrome Stable Update advisory for additional technical context.

Detection Methods for CVE-2026-13806

Indicators of Compromise

Chrome processes running versions below 150.0.7871.47 on managed endpoints
Unexpected child process creation or memory access patterns originating from chrome.exe renderer processes
Outbound network connections from Chrome to untrusted domains immediately following visits to unknown HTML content

Detection Strategies

Inventory installed Chrome versions across the fleet and flag any build older than 150.0.7871.47
Correlate browser telemetry with process behavior to identify renderer processes exhibiting cross-origin data access patterns
Monitor for anomalous accessibility API activity coinciding with navigation to unfamiliar domains

Monitoring Recommendations

Enable centralized browser version reporting through enterprise management tooling
Log and review Chrome crash reports and renderer termination events for signs of exploitation attempts
Alert on Chrome instances that fail to update within a defined maintenance window

How to Mitigate CVE-2026-13806

Immediate Actions Required

Update all Chrome desktop installations to version 150.0.7871.47 or later
Force a browser restart after deployment so patched binaries take effect
Verify update completion across managed endpoints using inventory tooling

Patch Information

Google released the fix in the Chrome stable channel update for desktop. Administrators should deploy version 150.0.7871.47 or later. Full details are available in the Google Chrome Stable Update advisory.

Workarounds

Restrict browsing to trusted sites through enterprise policy until patching is complete
Deploy web filtering to block access to unknown or newly registered domains that could deliver renderer exploits
Enforce automatic Chrome updates through the ChromeCleanupEnabled and update policies in enterprise configurations

bash

# Verify installed Chrome version on Linux endpoints
google-chrome --version

# Windows: query installed version via registry
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version