CVE-2026-96847 in Windows
Summary
by MITRE • 10/14/2026
Untrusted pointer dereference in WebDAV allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described involves an untrusted pointer dereception within the Windows Web Distributed Authoring and Versioning (WebDAV) service, a component that facilitates file sharing over HTTP protocols. This specific flaw permits an authenticated user who has local access to the system to execute arbitrary code with elevated privileges, effectively achieving privilege escalation from their current restricted context to higher-level permissions such as SYSTEM or Administrator level. The core technical issue stems from improper validation of pointers passed by users into WebDAV processing routines. When a malicious actor constructs specific requests containing crafted data structures, they can manipulate memory addresses in ways that bypass standard security checks. This allows the attacker to redirect execution flow to code injected or controlled by them, rather than following the intended program logic. Such vulnerabilities are typically categorized under CWE-416, which refers to Use After Free errors, although in this context it manifests as an untrusted pointer dereference where memory safety is compromised due to lack of rigorous bounds checking and type validation on input data handled by the WebDAV stack.
From a tactical perspective, this vulnerability aligns with MITRE ATT&CK techniques related to privilege escalation via local exploits. An attacker leveraging this flaw would likely operate within the context of an authenticated user account that has limited privileges but sufficient access to interact with network services running on the host machine. By exploiting the pointer dereference issue, the attacker can bypass security boundaries enforced by the operating system's integrity levels and mandatory access controls. The operational impact is severe because it allows lateral movement or persistence within a compromised environment without requiring physical presence or remote code execution vulnerabilities in other components. Once elevated privileges are obtained, the adversary gains full control over the affected system, enabling them to install backdoors, exfiltrate sensitive data, modify security policies, and potentially pivot to other systems on the network using valid administrative credentials.
Mitigation strategies for this vulnerability primarily involve applying vendor-provided patches that address the underlying memory management flaws in the WebDAV service implementation. Organizations should ensure that all systems running affected versions of Windows are updated with the latest cumulative updates released by Microsoft, which typically include fixes for such kernel and driver-level vulnerabilities. In environments where immediate patching is not feasible due to operational constraints, network segmentation can help limit exposure by restricting access to ports associated with WebDAV services from untrusted networks. Additionally disabling unnecessary WebDAV extensions or limiting the scope of users who have write permissions on shared folders can reduce the attack surface. Security monitoring solutions should be configured to detect anomalous behavior indicative of exploitation attempts, such as unusual memory allocation patterns or unexpected privilege changes following interactions with file sharing services. Regular vulnerability assessments and penetration testing focused on network service configurations are also recommended to identify similar weaknesses before they can be exploited by malicious actors seeking to escalate privileges within corporate networks.