CVE-2026-11230: Chrome Use-After-Free Vulnerability in Extensions (CVSS 8.8)

Technical summary

CVE-2026-11230 is a use-after-free (CWE-416) in Chrome's Extensions handling code. Use-after-free flaws occur when memory is accessed after it has been deallocated, potentially allowing an attacker to corrupt heap state or redirect execution. The vulnerability requires user interaction (visiting a crafted webpage) and network accessibility but no special privileges. The attack surface is the extension system, which handles significant browser functionality. Exploitation results in code execution within the Chrome sandbox—a critical control that isolates the browser process from the host OS.

Business impact

Exploitation could lead to theft of sensitive data accessed through the browser (credentials, session tokens, personal information), installation of malicious extensions, or lateral movement within an organization if the browser process has access to internal resources. The sandbox containment limits direct OS-level compromise, but a sandbox escape (separate vulnerability) could elevate the risk substantially. Enterprise environments with users running older Chrome versions face higher risk, particularly if extensions are widely deployed for business functions.

Affected systems

Google Chrome versions before 149.0.7827.53 are affected. The vulnerability is also relevant to Chromium-based browsers and operating systems (Windows, macOS, Linux) where Chrome is deployed. Check your Chrome version under Settings > About Chrome to determine exposure. Any system where users may visit untrusted websites is at risk.

Exploitability

Exploitation requires crafting a malicious HTML page and convincing a user to visit it—a moderate barrier compared to network worms or zero-click attacks. The attack does not require special browser plugins, user configuration changes, or multiple steps beyond the initial visit. Once a user lands on the malicious page, the vulnerability can be triggered automatically. No public exploit code is known to exist, but the CVSS vector (AC:L) indicates exploitation is straightforward once an attacker understands the flaw.

Remediation

Update Google Chrome to version 149.0.7827.53 or later. Chrome typically auto-updates; verify the update by navigating to Settings > About Chrome, which will check and apply any pending updates automatically. For managed enterprise deployments, ensure your deployment pipeline rolls out the patched version to all endpoints. Verify patch application within 48–72 hours of release, as this vulnerability is network-accessible and user-triggerable.

Patch guidance

Verify you are running Chrome 149.0.7827.53 or later. Go to Settings > About Chrome; the browser will display your current version and automatically check for updates. For enterprises using Google Chrome policies (Chromium Admin Console or Group Policy), set the minimum version requirement to 149.0.7827.53 or higher. Test the update on a pilot group of machines before mass deployment to rule out compatibility issues with critical extensions. Disable auto-update only if you have robust manual update procedures; otherwise, keep auto-update enabled to reduce the window of exposure.

Detection guidance

Monitor for failed or pending Chrome updates in your endpoint management solution. Review user activity logs for visits to suspicious or newly registered domains that might host exploit pages. If you have extension telemetry, flag any unexpected extension installations or modifications around the time of the vulnerability disclosure. Check browser history or network logs for unusual connections during sessions before the user updated Chrome. EDR tools may flag sandbox escape attempts or unusual extension behavior, though the vulnerability itself is sandboxed and may not trigger host-level alerts.

Why prioritize this

Although the Chromium project classified this as Low severity, the CVSS 3.1 score of 8.8 (HIGH) reflects realistic impact: any successful exploitation results in full code execution with access to browser memory, cached credentials, and active sessions. The low barrier to exploitation (user must visit a page) and the ubiquity of Chrome in both consumer and enterprise environments elevate this beyond its Chromium rating. Prioritize patching for user-facing endpoints, especially those accessing sensitive data or internal applications through the browser.

Risk score, explained

CVSS 3.1 assigns 8.8 (HIGH) because: (1) Attack Vector is Network—no physical access needed; (2) Attack Complexity is Low—exploitation does not require special conditions or user-level configuration; (3) Privileges Required is None; (4) User Interaction is Required (the user must visit the malicious page), reducing the score slightly; (5) Scope is Unchanged (impact is limited to the Chrome process, not the OS); (6) Confidentiality, Integrity, and Availability impacts are all High—an attacker gains full control over the sandboxed process. The discrepancy with Chromium's Low rating reflects different risk modeling: Chromium emphasized the sandbox boundary, while CVSS emphasizes the compromise of the browser process itself, which is often a user's primary attack surface for web-based threats.

Frequently asked questions