CVE-2026-79226: Google Chrome Privilege Escalation Vulnerability

CVE-2026-79226 Overview

CVE-2026-79226 is an improper privilege management vulnerability [CWE-269] in the Regional Capabilities component of Google Chrome. The flaw affects Chrome versions prior to 152.0.7977.65. A remote attacker can bypass system access restrictions by convincing a user to install a crafted Chrome extension. Google classifies the Chromium security severity as Medium.

Critical Impact
A crafted malicious extension can bypass system access restrictions enforced by Chrome's Regional Capabilities logic, enabling unauthorized use of privileged browser features through social engineering.

Affected Products

Google Chrome versions prior to 152.0.7977.65 (Desktop Stable channel)
Chromium-based browsers that share the affected Regional Capabilities code path
All supported desktop platforms (Windows, macOS, Linux) running vulnerable builds

Discovery Timeline

2026-08-25 - CVE-2026-79226 published to NVD
2026-08-26 - Last updated in NVD database

Technical Details for CVE-2026-79226

Vulnerability Analysis

The vulnerability resides in Chrome's Regional Capabilities subsystem. This component governs feature availability and access controls that vary by user region. Improper privilege management [CWE-269] allows a crafted Chrome extension to operate outside the boundaries the browser enforces on standard extensions.

Exploitation depends on user interaction. The attacker must persuade the victim to install a malicious extension through social engineering. Once installed, the extension leverages the privilege management flaw to bypass system access restrictions that would normally block privileged operations.

The Exploit Prediction Scoring System places CVE-2026-79226 in the lower probability range for near-term exploitation. Medium severity reflects the required user interaction and constrained impact scope relative to remote code execution flaws in the browser.

Root Cause

The root cause is a privilege management gap in the Regional Capabilities logic. The component does not consistently validate the caller context when an extension requests access to capabilities gated by regional or system-level restrictions. This gap lets an extension assert privileges it should not hold.

Attack Vector

The attack vector is remote and requires user action. An attacker publishes or distributes a crafted Chrome extension and lures a user into installing it. The extension then invokes the affected Regional Capabilities interfaces to bypass access restrictions. Refer to Chromium Issue #513607252 and the Google Chrome Stable Update advisory for additional technical context.

Detection Methods for CVE-2026-79226

Indicators of Compromise

Installation of Chrome extensions from sources outside the Chrome Web Store or from unverified publishers
Extension manifest files requesting broad permissions or host_permissions inconsistent with stated functionality
Chrome process activity accessing regional or system-scoped APIs from an extension context on builds prior to 152.0.7977.65
Unexpected changes to browser locale, search provider, or region-specific feature flags following extension installation

Detection Strategies

Inventory installed Chrome extensions across managed endpoints and compare against an approved allowlist
Alert on new extension installations that use chrome://extensions sideloading or developer mode outside authorized workflows
Correlate browser version telemetry with extension install events to identify vulnerable hosts running untrusted extensions
Review enterprise policies for ExtensionInstallSources and ExtensionInstallBlocklist to catch installations that bypass controls

Monitoring Recommendations

Ingest Chrome enterprise reporting and endpoint telemetry into a central data lake for extension install visibility
Monitor outbound traffic from browser processes to unfamiliar domains after new extension installation
Track Chrome version distribution to confirm all endpoints run 152.0.7977.65 or later

How to Mitigate CVE-2026-79226

Immediate Actions Required

Update Google Chrome to version 152.0.7977.65 or later on all Windows, macOS, and Linux endpoints
Audit installed extensions and remove any that are unsigned, sideloaded, or from unverified developers
Restrict extension installation using enterprise policy so users cannot install arbitrary extensions
Reinforce user awareness that extension installation prompts should be treated as a security-relevant decision

Patch Information

Google addressed CVE-2026-79226 in Chrome Stable 152.0.7977.65. Full details are published in the Google Chrome Stable Update release notes and tracked in Chromium Issue #513607252. Chromium-based browsers should apply the equivalent upstream fix from their vendors.

Workarounds

Enforce Chrome's ExtensionInstallBlocklist policy set to * and use ExtensionInstallAllowlist to permit only vetted extension IDs
Disable developer mode extension loading through group policy on managed endpoints
Block installation of extensions outside the Chrome Web Store using ExtensionInstallSources
Segment high-value user populations onto browser profiles that prohibit third-party extensions entirely

bash

# Configuration example: Chrome enterprise policy to restrict extensions (Linux managed policy)
# /etc/opt/chrome/policies/managed/extension_policy.json
{
  "ExtensionInstallBlocklist": ["*"],
  "ExtensionInstallAllowlist": [
    "<approved-extension-id-1>",
    "<approved-extension-id-2>"
  ],
  "ExtensionInstallSources": ["https://chrome.google.com/webstore/*"],
  "DeveloperToolsAvailability": 2
}