CVE-2026-40144 in Endpoint Privilege Management
Summary
by MITRE • 08/17/2026
A memory-corruption vulnerability exists in a kernel-mode component of BeyondTrust Endpoint Privilege Management (Windows deployments) prior to version 26.1.2. Insufficient validation of input processed by the component may result in memory being accessed outside its intended bounds.
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Analysis
by VulDB Data Team • 08/17/2026
The identified security flaw resides within the kernel-mode components of BeyondTrust Endpoint Privilege Management for Windows environments, specifically affecting versions released prior to version 26.1.2. This vulnerability is classified as a memory-corruption issue stemming from insufficient validation of input data processed by the affected component. In operating system architectures, particularly Microsoft Windows, kernel mode represents the highest level of privilege where code has unrestricted access to hardware and system resources. When software operating in this context fails to properly validate inputs before processing them, it creates an opportunity for attackers to manipulate memory structures in ways that were not intended by the developers. The specific nature of this flaw involves accessing memory outside its allocated bounds, which is a critical failure in boundary checking mechanisms designed to isolate different processes and protect system integrity from unauthorized access or modification.
From a technical perspective, insufficient input validation leading to out-of-bounds memory access typically manifests as either a buffer overflow or an off-by-one error within the kernel driver code. When the component receives data that exceeds its expected size or format constraints without adequate checks, it may write data beyond the end of a allocated buffer or read from invalid memory addresses. This behavior can lead to various forms of memory corruption, including stack smashing, heap overflows, or use-after-free conditions depending on how the vulnerable code interacts with system memory management subsystems. Such errors compromise the stability and security boundaries that kernel-mode drivers are responsible for maintaining, potentially allowing an attacker to overwrite critical data structures such as function pointers, exception handlers, or process control blocks within the operating system core.
The operational impact of this vulnerability is severe due to its location in a privileged component running with SYSTEM-level privileges. An authenticated local user who can interact with the BeyondTrust Endpoint Privilege Management service could potentially exploit this flaw to execute arbitrary code within kernel space. This effectively grants the attacker full control over the underlying operating system, bypassing standard security controls and user account restrictions. The ability to escalate privileges from a low-privileged user context to SYSTEM level represents a critical escalation of privilege scenario. Furthermore, because the vulnerability exists in a widely deployed endpoint management solution, successful exploitation could lead to widespread compromise across an organization's network if multiple endpoints are running vulnerable versions. Attackers may leverage this access to install malware, exfiltrate sensitive data, create backdoors for persistent access, or pivot laterally to other systems within the enterprise environment.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-120, which describes buffer copy without checking size limits, and more broadly falls under CWE-20 regarding improper input validation. In terms of offensive security frameworks such as MITRE ATT&CK, this flaw facilitates techniques associated with Privilege Escalation via Kernel Exploitation (T1068) and potentially Defense Evasion through kernel-level rootkits if the attacker chooses to hide their presence at a low level in the operating system stack. The lack of proper bounds checking is a fundamental software engineering defect that undermines the principle of least privilege by allowing lower-privileged entities to achieve higher levels of access through memory manipulation rather than legitimate administrative actions.
To mitigate this risk, organizations must prioritize patching BeyondTrust Endpoint Privilege Management installations to version 26.1.2 or later immediately upon availability. The vendor has addressed the input validation logic in these newer releases to ensure that all data processed by the kernel-mode component is rigorously checked against expected boundaries before memory operations are executed. In addition to applying patches, administrators should enforce strict application control policies and monitor for unusual privilege escalation attempts using endpoint detection and response tools. Regular auditing of installed software versions across the enterprise fleet is essential to identify any remaining systems running vulnerable builds. Furthermore, limiting local administrative rights where possible reduces the attack surface by minimizing the number of user accounts capable of interacting with privileged services that might contain such vulnerabilities.