CVE-2026-11251: Google Chrome Auth Bypass Vulnerability

CVE-2026-11251 Overview

CVE-2026-11251 is a policy enforcement weakness in the Password Manager component of Google Chrome prior to version 149.0.7827.53. A remote attacker who has already compromised the renderer process can bypass discretionary access control by serving a crafted HTML page. Chromium classifies the security severity as Low, and the issue is tracked under [CWE-20] (Improper Input Validation).

The flaw affects Chrome installations across Windows, macOS, and Linux. Exploitation requires user interaction and a pre-existing renderer compromise, which limits practical impact but still permits unauthorized access to Password Manager data flows within the browser sandbox model.

Critical Impact
An attacker controlling a compromised renderer can bypass Password Manager discretionary access controls through a crafted HTML page, undermining browser-level credential isolation.

Affected Products

Google Chrome prior to 149.0.7827.53
Chrome on Microsoft Windows, Apple macOS, and Linux
Chromium-based builds that incorporate the vulnerable Password Manager code path

Discovery Timeline

2026-06-05 - CVE-2026-11251 published to the National Vulnerability Database (NVD)
2026-06-05 - Last updated in NVD database
2026-06 - Google releases fixed Chrome Stable build 149.0.7827.53 (Google Chrome Stable Update)

Technical Details for CVE-2026-11251

Vulnerability Analysis

The vulnerability lives in the Password Manager component, which is responsible for storing and autofilling user credentials in Chrome. Password Manager enforces discretionary access control policies that gate how renderer processes can request or interact with stored credential data. CVE-2026-11251 reflects insufficient enforcement of those policies when the renderer process is already attacker-controlled.

An attacker who has compromised the renderer can craft an HTML page that triggers credential-handling code paths in a way the policy layer fails to fully validate. The bug is categorized as [CWE-20] Improper Input Validation, indicating that input or state crossing the renderer-to-browser trust boundary is not sufficiently checked before access decisions are made.

User interaction is required, and the attack complexity is high, which constrains opportunistic abuse. Confidentiality impact is limited to information accessible through the Password Manager surface; integrity and availability are not affected.

Root Cause

The root cause is incomplete policy enforcement at the boundary between the renderer process and the Password Manager service. The browser trusts certain renderer-supplied context when applying discretionary access control, allowing a malicious renderer to influence those checks through specifically structured HTML. See the Chromium Issue Tracker Entry for upstream details.

Attack Vector

Exploitation is network-based but indirect. The attacker must first compromise the Chrome renderer process, typically by chaining a separate renderer-side vulnerability. The attacker then serves a crafted HTML page that exercises the unguarded Password Manager pathway, bypassing the access control checks that normally isolate credential operations from untrusted web content.

No verified public proof-of-concept code is available for this issue. Refer to the upstream Chromium Issue Tracker Entry once Google opens the bug for technical specifics.

Detection Methods for CVE-2026-11251

Indicators of Compromise

Chrome client versions reporting below 149.0.7827.53 in inventory or User-Agent telemetry
Renderer process crashes or anomalous IPC traffic to the Password Manager service preceding credential autofill events
Unexpected credential autofill activity on attacker-controlled or recently visited untrusted domains

Detection Strategies

Inventory Chrome versions across managed endpoints and flag any host below 149.0.7827.53 for remediation
Correlate browser exploitation indicators (renderer crashes, sandbox escapes, suspicious child processes) with subsequent Password Manager activity
Hunt for outbound HTTPS sessions that follow renderer anomalies and resemble credential exfiltration

Monitoring Recommendations

Forward Chrome enterprise reporting and endpoint browser telemetry into your SIEM or data lake for version and event tracking
Monitor process integrity and parent-child relationships for chrome.exe renderer processes on Windows and equivalent processes on macOS and Linux
Alert on enterprise policy violations that disable or downgrade Chrome auto-update on managed fleets

How to Mitigate CVE-2026-11251

Immediate Actions Required

Update Google Chrome to 149.0.7827.53 or later on all Windows, macOS, and Linux endpoints
Verify that Chrome auto-update is enabled and not blocked by group policy or network egress restrictions
Restart browser sessions after patch deployment to ensure the vulnerable code path is unloaded

Patch Information

Google addressed the issue in Chrome Stable 149.0.7827.53. The fix is delivered through the standard Chrome update channel and documented in the Google Chrome Stable Update release notes. Chromium-based browser vendors should incorporate the upstream patch into their own release pipelines.

Workarounds

Disable Chrome's built-in Password Manager via enterprise policy (PasswordManagerEnabled=false) until patching completes
Restrict browsing to trusted sites and enforce site isolation to reduce the likelihood of an initial renderer compromise
Apply strict Content Security Policy and network egress controls on high-value workstations handling credentials

bash

# Configuration example: disable Chrome Password Manager via enterprise policy
# Linux managed policy
sudo tee /etc/opt/chrome/policies/managed/disable_pwm.json >/dev/null <<'EOF'
{
  "PasswordManagerEnabled": false
}
EOF

# Windows (registry)
# reg add "HKLM\Software\Policies\Google\Chrome" /v PasswordManagerEnabled /t REG_DWORD /d 0 /f