CVE-2026-0251 Overview
CVE-2026-0251 covers multiple local privilege escalation vulnerabilities in the Palo Alto Networks GlobalProtect™ app. A local user can escalate privileges to NT AUTHORITY\SYSTEM on Windows and root on macOS and Linux. The flaw allows a non-administrative user to execute arbitrary commands with administrative privileges on affected endpoints. The weakness maps to [CWE-426] Untrusted Search Path. The GlobalProtect app on iOS, Android, Chrome OS, and the GlobalProtect UWP app are not affected.
Critical Impact
A local, authenticated user can obtain full administrative control over Windows, macOS, and Linux endpoints running the GlobalProtect app.
Affected Products
- Palo Alto Networks GlobalProtect app for Windows
- Palo Alto Networks GlobalProtect app for macOS
- Palo Alto Networks GlobalProtect app for Linux
Discovery Timeline
- 2026-05-13 - CVE-2026-0251 published to the National Vulnerability Database (NVD)
- 2026-05-13 - Last updated in the NVD database
Technical Details for CVE-2026-0251
Vulnerability Analysis
The GlobalProtect app runs privileged components on Windows, macOS, and Linux endpoints. Multiple local privilege escalation flaws in these components allow a local user with low privileges to execute arbitrary commands as NT AUTHORITY\SYSTEM on Windows or root on Unix-based systems. The vulnerability requires local access and low privileges but no user interaction. Successful exploitation results in full compromise of the host operating system, including the ability to install persistent malware, disable endpoint security tooling, and access protected secrets.
Root Cause
The underlying weakness is classified as [CWE-426] Untrusted Search Path. Privileged GlobalProtect processes resolve executables, libraries, or supporting resources from locations that a non-administrative user can influence. When the privileged service loads attacker-controlled content from these paths, the attacker's code executes within the security context of the service rather than the calling user.
Attack Vector
The attack vector is local. An authenticated user on a system running an affected GlobalProtect app version plants a malicious file in a search path consulted by the privileged GlobalProtect component. When the service starts or performs an operation that triggers the resolution, the planted payload runs with elevated privileges. Refer to the Palo Alto Networks Advisory for component-specific technical details.
Detection Methods for CVE-2026-0251
Indicators of Compromise
- Unexpected executables, DLLs, or shared objects appearing in directories writable by standard users that overlap with GlobalProtect process search paths.
- New child processes spawned by GlobalProtect services (PanGPS.exe on Windows, gpd or related daemons on macOS and Linux) that do not match the signed product binaries.
- Local user accounts performing administrative actions shortly after interacting with GlobalProtect components.
Detection Strategies
- Monitor file integrity in GlobalProtect installation and working directories, alerting on writes by non-administrative users.
- Hunt for process lineage where the GlobalProtect privileged service launches cmd.exe, powershell.exe, /bin/sh, or other shells.
- Validate digital signatures on binaries and libraries loaded by GlobalProtect components at runtime.
Monitoring Recommendations
- Forward endpoint process creation, image load, and file creation events to a centralized logging platform for retroactive hunting.
- Track GlobalProtect version inventory across the fleet to identify endpoints still running vulnerable builds.
- Alert on privilege transitions where a standard user session is followed by SYSTEM or root activity originating from GlobalProtect process trees.
How to Mitigate CVE-2026-0251
Immediate Actions Required
- Identify all endpoints running the GlobalProtect app on Windows, macOS, and Linux and inventory installed versions.
- Apply the fixed version specified in the Palo Alto Networks Advisory as soon as it is available in your environment.
- Restrict local logon rights on high-value systems to reduce the population of users able to attempt local exploitation.
Patch Information
Palo Alto Networks has published guidance and fixed versions in the vendor advisory. Consult the Palo Alto Networks Advisory for the exact fixed releases for each affected platform and follow the documented upgrade procedure.
Workarounds
- Limit interactive and remote local access on endpoints to trusted administrators where operationally feasible.
- Enforce filesystem permissions that prevent standard users from writing to directories consulted by GlobalProtect privileged processes.
- Use application control or allowlisting to block unsigned binaries from loading inside GlobalProtect process contexts.
# Configuration example: audit non-admin write access to GlobalProtect directories on Linux
find /opt/paloaltonetworks/globalprotect -perm -o=w -ls
find /opt/paloaltonetworks/globalprotect -not -user root -ls
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
