CVE-2026-11689: Google Chrome Auth Bypass Vulnerability

CVE-2026-11689 Overview

CVE-2026-11689 is an insufficient policy enforcement flaw in the Passwords component of Google Chrome. The vulnerability affects Chrome versions prior to 149.0.7827.103 across Windows, macOS, and Linux desktop builds. A remote attacker who has already compromised the renderer process can bypass Chrome's site isolation boundary by serving a crafted HTML page to the victim. The Chromium project rates the issue High severity, and it carries CWE-20 (Improper Input Validation).

Critical Impact

Successful exploitation lets an attacker who controls the renderer break the cross-site isolation guarantee that prevents one origin from reading data, including stored passwords, belonging to another origin.

Affected Products

• Google Chrome versions prior to 149.0.7827.103
• Chrome desktop builds on Microsoft Windows
• Chrome desktop builds on Apple macOS and Linux

Discovery Timeline

• 2026-06-09 - CVE-2026-11689 published to the National Vulnerability Database
• 2026-06-10 - Last updated in the NVD database

Technical Details for CVE-2026-11689

Vulnerability Analysis

The weakness lives in policy enforcement logic inside Chrome's Passwords subsystem. Site isolation places each site in its own renderer process so a compromised renderer cannot read another origin's data. The Passwords component fails to consistently apply that boundary when handling content delivered through a crafted HTML page. An attacker who has already achieved code execution inside a renderer process can therefore reach password material or related state outside the renderer's allowed origin.

Exploitation requires two preconditions. First, the attacker must already control a renderer process, typically through a chained renderer exploit such as a V8 type confusion or use-after-free. Second, the victim must load attacker-controlled HTML, satisfying the user interaction requirement in the CVSS vector. Once those conditions are met, the bypass enables cross-origin disclosure and tampering. The CVE references Chromium issue 517486004 for the underlying defect.

Root Cause

The root cause is improper input validation tied to site isolation policy decisions in the Passwords component, classified as [CWE-20]. Trust decisions are made on data that a compromised renderer can influence, allowing the renderer to escape its assigned site boundary.

Attack Vector

The attack vector is network based. The attacker hosts a crafted HTML page and lures the victim to visit it, often as the second stage of a renderer compromise chain. No privileges are required on the victim system beyond running a vulnerable Chrome build. No public proof-of-concept code is currently available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability is 0.025%.

No verified public code is available. See the Chromium Issue Tracker entry and the Google Chrome Stable Update advisory for vendor details.

Detection Methods for CVE-2026-11689

Indicators of Compromise

• Chrome processes loading unexpected cross-origin HTML immediately after a renderer crash or sandbox alert
• Outbound traffic from endpoint browsers to newly registered or low-reputation domains serving HTML with embedded password-form scaffolding
• Browser telemetry showing password autofill events on origins that do not match stored credential records

Detection Strategies

• Inventory Chrome versions across the fleet and flag any build below 149.0.7827.103 as exposed
• Correlate renderer process crashes with subsequent navigation to attacker-controlled URLs in endpoint telemetry
• Hunt for renderer exploit precursors such as anomalous JIT spray patterns, oversized WebAssembly modules, or suspicious child-process spawn chains from chrome.exe

Monitoring Recommendations

• Forward browser process telemetry and DNS resolutions to a centralized data lake for retrospective hunting
• Alert on Chrome child processes that perform unusual file or credential store access immediately after loading external HTML
• Track password manager API usage to detect exfiltration attempts following a suspected renderer compromise

How to Mitigate CVE-2026-11689

Immediate Actions Required

• Update Google Chrome to version 149.0.7827.103 or later on all Windows, macOS, and Linux endpoints
• Force-restart Chrome after deploying the update so the patched binaries take effect
• Validate the deployed version through management tooling and quarantine endpoints that remain on vulnerable builds

Patch Information

Google fixed the issue in the Chrome Stable channel build 149.0.7827.103. Details are published in the Chrome Releases blog, with the underlying defect tracked in Chromium issue 517486004. Enterprises using managed Chrome should push the update through Google Update, Chrome Browser Cloud Management, or their existing software distribution platform.

Workarounds

• No vendor workaround exists; updating Chrome is the only supported remediation
• Restrict access to untrusted websites through enterprise web filtering until patches are confirmed deployed
• Disable Chrome's built-in password manager and migrate to an isolated credential store on hosts that cannot be patched promptly

# Verify the installed Chrome version on Linux or macOS endpoints
google-chrome --version
# Expected output: Google Chrome 149.0.7827.103 or higher

# Windows: query the installed version from the registry
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv