SB2026050677 - Multiple vulnerabilities in WatchGuard Agent on Windows
Published: May 6, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 vulnerabilities.
1) Improper access control (CVE-ID: CVE-2026-6787)
The vulnerability allows a local user to escalate privileges to SYSTEM.
The vulnerability exists due to improper access control in the agent service when handling local service interactions. A local user can exploit the chained service vulnerabilities to escalate privileges to SYSTEM.
2) Improper access control (CVE-ID: CVE-2026-6788)
The vulnerability allows a local user to escalate privileges to SYSTEM.
The vulnerability exists due to improper access control in the agent service when handling local service interactions. A local user can exploit the chained service vulnerabilities to escalate privileges to SYSTEM.
3) Incorrect permission assignment for critical resource (CVE-ID: CVE-2026-41288)
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to incorrect permission assignment for a resource in the patch management component when handling patch management resources. A local user can access or modify a resource with overly permissive permissions to escalate privileges.
The issue can lead to privilege escalation to NT AUTHORITY\SYSTEM.
4) Stack-based buffer overflow (CVE-ID: CVE-2026-41286)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in the WatchGuard Agent discovery service on Windows when handling discovery requests. A remote attacker can send a specially crafted discovery request to cause a denial of service.
5) Stack-based buffer overflow (CVE-ID: CVE-2026-41287)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in the WatchGuard Agent discovery service on Windows when handling discovery requests. A remote attacker can send a specially crafted request to cause a denial of service.
Remediation
Install update from vendor's website.