CVE-2026-7948: Google Chrome Privilege Escalation Flaw

CVE-2026-7948 Overview

CVE-2026-7948 is a race condition vulnerability in the Chromoting component of Google Chrome on Windows. The flaw affects Chrome versions prior to 148.0.7778.96 and is tracked under [CWE-362] (Concurrent Execution using Shared Resource with Improper Synchronization). A local attacker can exploit the race by delivering a malicious file, leading to privilege escalation on the affected host. Google rates the Chromium security severity as Medium, while NVD scores the issue at 7.5 with a HIGH rating. Chromoting is the underlying component for Chrome Remote Desktop, so the vulnerability exposes systems running Chrome with remote desktop functionality enabled.

Critical Impact

Successful exploitation allows a local attacker to escalate privileges on Windows systems running vulnerable Chrome builds, undermining host integrity and confidentiality.

Affected Products

• Google Chrome on Windows prior to 148.0.7778.96
• Microsoft Windows hosts running the Chromoting component
• Chrome Remote Desktop deployments built on vulnerable Chrome versions

Discovery Timeline

• 2026-05-06 - CVE-2026-7948 published to NVD
• 2026-05-07 - Last updated in NVD database

Technical Details for CVE-2026-7948

Vulnerability Analysis

The vulnerability resides in Chromoting, the host-side component that powers Chrome Remote Desktop on Windows. A race condition occurs when multiple threads or processes access shared resources without proper synchronization. An attacker who can plant a malicious file on the local system can trigger the race window during Chromoting operations. Winning the race allows the attacker to influence privileged behavior performed by the Chromoting host process. The result is privilege escalation from a low-privileged context to a higher-privileged Chromoting service context.

Root Cause

The root cause is improper synchronization of concurrent operations in Chromoting, classified as [CWE-362]. Chromoting reads or operates on file system resources without atomically validating their state. Between the validation step and the use step, an attacker substitutes a malicious file. This time-of-check to time-of-use pattern lets attacker-controlled content reach a privileged execution path.

Attack Vector

Exploitation requires local file placement and user interaction with the Chromoting host. The attacker stages a malicious file in a location processed by Chromoting. The attacker then races the host to swap the file at the precise moment Chromoting consumes it. Attack complexity is high because timing must be precise, but no privileges are required to stage the file. Refer to the Chromium Issue Tracker Entry for upstream technical context.

Detection Methods for CVE-2026-7948

Indicators of Compromise

• Unexpected creation, replacement, or deletion of files in directories accessed by the Chromoting host process on Windows.
• Chromoting host processes spawning child processes with elevated privileges or unusual command lines.
• Chrome Remote Desktop sessions initiated outside of normal administrative windows.

Detection Strategies

• Inventory endpoints and confirm Chrome version against 148.0.7778.96 to identify exposed hosts.
• Hunt for file system operations targeting Chromoting working directories that occur in tight time windows with rapid renames or replacements.
• Correlate Chromoting host process activity with local user context changes that suggest privilege escalation.

Monitoring Recommendations

• Enable Windows Security event auditing for file create, rename, and handle duplication events in Chromoting paths.
• Monitor process lineage for remoting_host.exe and related binaries spawning unexpected children.
• Alert on Chrome auto-update failures that leave hosts pinned below 148.0.7778.96.

How to Mitigate CVE-2026-7948

Immediate Actions Required

• Update Google Chrome to version 148.0.7778.96 or later on all Windows endpoints.
• Restart Chrome and any active Chrome Remote Desktop host services to load the patched binaries.
• Verify Chrome auto-update is functional across managed fleets and remediate any stalled updates.

Patch Information

Google addressed the vulnerability in the Chrome Stable channel update referenced in the Google Chrome Update Announcement. Administrators should deploy Chrome 148.0.7778.96 or newer through enterprise update mechanisms such as Group Policy, Microsoft Intune, or Chrome Browser Cloud Management.

Workarounds

• Disable Chrome Remote Desktop and the Chromoting host service on systems where remote desktop functionality is not required.
• Restrict local user write access to directories used by the Chromoting host process to limit malicious file staging.
• Apply application allowlisting to block execution of untrusted files that could be used to trigger the race.

# Verify installed Chrome version on Windows
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv

# Force Chrome update via Google Update on managed hosts
"%ProgramFiles(x86)%\Google\Update\GoogleUpdate.exe" /ua /installsource scheduler