CVE-2026-115253 in WatchGuard
Summary
by MITRE • 10/22/2026
An incorrect permission assignment vulnerability in the WatchGuard Agent's log directory allows a local, authenticated non-administrative user to create, modify, append to, or delete the agent's log files and write other files into the directory. This allows an attacker to tamper with or destroy the agent's security logs and stage further local attacks by placing executable content in a directory owned by a privileged service.
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Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified involves an improper privilege assignment within the WatchGuard Agent software, specifically targeting the configuration of file system permissions for its log storage directory. This flaw represents a classic instance of insecure direct object reference or incorrect default permissions, where the operating system's access control mechanisms fail to restrict write operations to authorized administrative accounts only. In a properly secured environment, security logs are critical components of an organization's defense-in-depth strategy, serving as immutable records of system events and potential intrusions. However, in this scenario, the directory housing these logs is configured with permissions that allow local, authenticated non-administrative users to perform write operations such as creating new files, modifying existing ones, appending data, or deleting content entirely. This misconfiguration effectively grants a lower-privilege user control over critical security artifacts managed by a higher-privileged service process.
From an operational perspective, the immediate impact of this vulnerability is the ability for an attacker to compromise the integrity and availability of security logging mechanisms. By tampering with log files, an adversary can obscure their malicious activities, making forensic analysis and incident response significantly more difficult or impossible. This aligns directly with the MITRE ATT&CK technique T1070, which covers Indicator Removal on Host systems, specifically sub-techniques related to clearing logs such as Windows Event Log Clearing (T1070.004) or File Deletion (T1070.002). Furthermore, the ability to delete log files constitutes a denial of service against the logging infrastructure, potentially violating compliance requirements for audit trail retention found in standards like NIST SP 800-53 and ISO/IEC 27001. The destruction or alteration of these records undermines the organization's ability to detect ongoing attacks and meet regulatory obligations regarding data integrity and accountability.
Beyond simple log tampering, this vulnerability presents a severe risk for privilege escalation through file system manipulation. Because the vulnerable directory is owned by a privileged service account, any files written into it inherit specific security contexts or are executed under that higher-privilege identity depending on how the WatchGuard Agent processes its logs. An attacker can exploit this by placing malicious executable content within the log directory, hoping to trigger execution by the agent process running with elevated privileges. This technique is a form of insecure temporary file handling and aligns with CWE-250 (Execution with Unnecessary Privileges) and CWE-732 (Incorrect Permission Assignment for Critical Resource). If successful, this allows an attacker to escalate from a standard user account to administrative or system-level access without needing to exploit separate kernel vulnerabilities or credential theft mechanisms.
To mitigate this vulnerability, immediate remediation should focus on correcting the file system permissions associated with the WatchGuard Agent's log directory. Administrators must ensure that write and modify permissions are strictly limited to the service account running the agent and local administrators only. Regular auditing of these permissions is recommended to prevent drift or accidental misconfiguration during software updates. Additionally, organizations should implement integrity monitoring solutions such as Windows File History or third-party file integrity monitoring tools to detect unauthorized changes to log files in real-time. Applying the latest vendor patches that address this permission issue is essential for restoring the security posture of the endpoint and ensuring the reliability of security telemetry data used for threat detection and compliance reporting.