CVE-2026-30902: Zoom Windows Client Privilege Escalation

CVE-2026-30902 Overview

CVE-2026-30902 is a privilege escalation vulnerability affecting certain Zoom Clients for Windows. The vulnerability stems from improper privilege management, which allows an authenticated local user to escalate their privileges on the affected system. This type of vulnerability is particularly concerning in enterprise environments where Zoom is widely deployed for video conferencing and collaboration.

Critical Impact

An authenticated attacker with local access can exploit this vulnerability to gain elevated privileges, potentially compromising the entire system and enabling further malicious activities.

Affected Products

• Zoom Clients for Windows (specific versions detailed in ZSB-26004)

Discovery Timeline

• 2026-03-11 - CVE-2026-30902 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2026-30902

Vulnerability Analysis

This vulnerability is classified under CWE-269 (Improper Privilege Management), indicating that the affected Zoom Client software fails to properly manage user privileges during certain operations. The flaw requires local access to exploit, meaning an attacker must already have some level of access to the target system. Once exploited, the attacker can elevate their privileges from a standard user to a higher privilege level, potentially gaining administrative or SYSTEM-level access on Windows systems.

The local attack vector means this vulnerability is most likely to be exploited in scenarios where an attacker has compromised a low-privileged user account, has physical access to a shared workstation, or is operating as an insider threat within an organization. The lack of required user interaction makes this vulnerability particularly dangerous once an attacker achieves initial access.

Root Cause

The root cause of CVE-2026-30902 lies in improper privilege management within the Zoom Client for Windows. This type of vulnerability typically occurs when software components fail to properly validate or restrict privilege levels during sensitive operations, such as file operations, inter-process communication, or service interactions. The Zoom Client may be executing certain operations with elevated privileges that can be manipulated by a lower-privileged user.

Attack Vector

The attack vector for CVE-2026-30902 is local, requiring an attacker to have authenticated access to the target Windows system. The attack can be executed without user interaction, meaning once an attacker has local access with low privileges, they can exploit the vulnerability directly. Successful exploitation results in a complete compromise of confidentiality, integrity, and availability on the affected system.

Potential attack scenarios include:

• A compromised standard user account exploiting the vulnerability to gain administrative privileges
• An insider threat leveraging the vulnerability to access sensitive data or systems beyond their authorization
• Post-exploitation privilege escalation following initial access via phishing or other attack vectors

For detailed technical information, refer to the Zoom Security Bulletin ZSB-26004.

Detection Methods for CVE-2026-30902

Indicators of Compromise

• Unexpected privilege escalation events involving Zoom-related processes
• Anomalous process creation with elevated privileges originating from Zoom Client components
• Suspicious file system modifications in Zoom installation directories
• Windows Event Log entries showing privilege changes associated with Zoom processes

Detection Strategies

• Monitor Windows Security Event logs for privilege escalation events (Event ID 4672, 4673) associated with Zoom processes
• Implement endpoint detection rules for abnormal child process spawning from Zoom Client executables
• Deploy behavior-based detection to identify unexpected system calls or API usage from Zoom components

Monitoring Recommendations

• Enable enhanced logging on endpoints running Zoom Client for Windows
• Configure SIEM alerts for privilege escalation patterns involving video conferencing applications
• Implement user behavior analytics to detect anomalous local privilege changes
• Review Zoom Client installation and update processes for unauthorized modifications

How to Mitigate CVE-2026-30902

Immediate Actions Required

• Update Zoom Client for Windows to the latest patched version as specified in the Zoom Security Bulletin
• Review and audit all systems running affected versions of Zoom Client for Windows
• Implement least privilege principles for user accounts across the organization
• Monitor systems for signs of exploitation until patches can be applied

Patch Information

Zoom has released a security update addressing this vulnerability. Organizations should consult the Zoom Security Bulletin ZSB-26004 for specific patch information and affected version details. It is strongly recommended to update to the latest available version of Zoom Client for Windows immediately.

Workarounds

• Restrict local access to systems with Zoom Client installed to trusted users only
• Implement application control policies to monitor and restrict Zoom Client behavior
• Consider temporarily removing Zoom Client from sensitive systems until patches are applied
• Enable additional endpoint monitoring and logging to detect exploitation attempts

# Configuration example
# Verify Zoom Client version and check for updates
# Open Zoom Client > Settings > General > Check for Updates

# PowerShell: Identify installed Zoom version
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" | Where-Object {$_.DisplayName -like "*Zoom*"} | Select-Object DisplayName, DisplayVersion

# Ensure automatic updates are enabled for Zoom Client
# Settings > General > Automatically keep Zoom desktop client up to date