CVE-2026-62832 in Windows
Summary
by MITRE • 08/11/2026
Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a classic privilege escalation issue within the Windows User Profile Service that exploits improper link resolution behavior during file operations. The flaw occurs when the service processes symbolic links or hard links without adequately validating their target paths, creating opportunities for attackers to manipulate file access patterns and gain elevated system privileges.
The technical implementation involves the User Profile Service's handling of file paths where symbolic links are followed without proper validation of the link targets. When an attacker can control or influence the creation of symbolic links in specific directories that the service accesses, they can redirect file operations to arbitrary locations on the filesystem. This behavior aligns with CWE-367, which addresses Time-of-Check to Time-of-Use (TOCTOU) vulnerabilities where the security check occurs at a different time than when the operation is performed.
From an operational perspective, this vulnerability requires local system access and authentication but does not necessitate network connectivity or complex attack vectors. The attacker must be able to create or modify symbolic links in directories that the User Profile Service processes, which typically includes user profile directories and temporary storage locations. This makes the attack surface relatively constrained but still highly impactful given the service's privileged execution context.
The privilege escalation mechanism works by having the service access a maliciously crafted link that points to sensitive system files or directories with elevated permissions. When the service follows the link and performs file operations, it inadvertently modifies or accesses protected resources that should only be available to administrators or system processes. This attack pattern corresponds to ATT&CK technique T1068, which covers privilege escalation through local exploitation of system services.
Mitigation strategies include implementing proper path validation mechanisms that prevent link following in sensitive contexts, restricting the ability to create symbolic links in critical service directories, and ensuring that file operations validate both the original path and the resolved target. Microsoft recommends applying the latest security updates, implementing least-privilege access controls for user profile directories, and monitoring for unauthorized symbolic link creation activities. The vulnerability demonstrates the importance of defensive programming practices around file system operations and highlights how seemingly simple path resolution can create significant security implications when not properly validated against malicious input or manipulation attempts.