CVE-2026-80075 in Windows
Summary
by MITRE • 09/09/2026
Heap-based buffer overflow in Windows Work Folders allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as a heap-based buffer overflow within the Microsoft Windows Work Folders service represents a critical security flaw that can be exploited by authenticated users to achieve arbitrary code execution with elevated system privileges. This specific component, designed to facilitate file synchronization and sharing across devices in enterprise environments, contains memory management errors where input data is copied into a pre-allocated heap region without sufficient bounds checking. When an attacker provides crafted or excessively large inputs during the synchronization process, the application writes beyond the allocated buffer boundaries, corrupting adjacent memory structures on the heap. This corruption can be leveraged to overwrite function pointers or exception handling records, thereby redirecting program execution flow to malicious shellcode injected by the attacker.
From a technical perspective, this flaw aligns with CWE-122, which classifies heap-based buffer overflows as vulnerabilities arising from improper validation of array indices or lengths during memory allocation and access operations. The exploitation mechanism typically involves precise control over the heap layout to ensure that critical data structures are overwritten in a predictable manner. Once the execution flow is hijacked, the attacker gains the ability to execute arbitrary code within the security context of the affected process. Since Work Folders often runs with significant privileges to manage file access and synchronization tasks successfully, this privilege escalation allows the compromised account to perform administrative actions, modify system configurations, install malware, or exfiltrate sensitive data that would otherwise be protected by standard user-level restrictions.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation without requiring physical access or complex remote exploitation vectors if network shares are exposed. An authorized attacker who has valid credentials on the target system can exploit this flaw during routine file operations, making detection difficult as normal application behavior triggers the condition. This aligns with MITRE ATT&CK technique T1068, which covers Exploitation for Privilege Escalation, specifically highlighting how attackers leverage software vulnerabilities to move from a low-privileged user account to higher-level permissions such as SYSTEM or Administrator. The ability to escalate privileges locally undermines the principle of least privilege and compromises the integrity of the entire host system, potentially leading to full domain compromise if the elevated credentials are used against other network resources.
Mitigation strategies must focus on both immediate patching and long-term architectural hardening. Organizations should immediately apply the latest security updates provided by Microsoft for Windows Work Folders components to address the underlying memory management flaws in the source code. In environments where updating is not immediately feasible, restricting access to Work Folders shares to only essential personnel can reduce the attack surface. Additionally implementing strict input validation policies and enabling advanced logging mechanisms can help detect anomalous file synchronization activities that may indicate exploitation attempts. Regular vulnerability assessments and penetration testing should be conducted to identify similar memory safety issues in other enterprise applications, ensuring a robust defense-in-depth posture against privilege escalation attacks.