CVE-2026-70185 in PowerShell
Summary
by MITRE • 10/14/2026
Protection mechanism failure in Windows PowerShell allows an authorized attacker to bypass a security feature locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described constitutes a critical protection mechanism failure within Microsoft Windows PowerShell, specifically enabling local privilege escalation or policy circumvention by authenticated users. This flaw indicates that the internal safeguards designed to restrict certain administrative actions or enforce execution policies can be manipulated through specific input sequences or configuration states known only to those with existing access privileges. The core technical issue lies in how PowerShell processes commands and validates constraints against its security context, allowing an attacker who has already gained a foothold on the system to bypass intended restrictions such as script signing requirements, constrained language mode, or execution policies that are meant to prevent unauthorized code execution.
From a technical perspective, this type of vulnerability often stems from improper validation of command parameters or insufficient checks when transitioning between different security contexts within the PowerShell engine. Attackers may exploit specific cmdlets or scripting constructs that fail to properly sanitize input before it is evaluated by the host environment. This allows for the execution of arbitrary code or the modification of system configurations in ways that were previously blocked by default settings. The failure is not necessarily a crash but rather a logical error where the security boundary assumed by the administrator does not align with the actual enforcement mechanisms implemented in the software, effectively rendering protective measures ineffective against determined local adversaries.
The operational impact of this vulnerability is significant for organizations relying on PowerShell as part of their endpoint protection strategy. Since PowerShell is deeply integrated into Windows operating systems and widely used for system administration, its compromise undermines a primary defense layer against malware and unauthorized changes. An attacker leveraging this flaw can escalate privileges to gain higher levels of access, install persistent backdoors, or exfiltrate sensitive data without triggering standard alerts associated with policy violations. This capability effectively neutralizes security controls that depend on restricting PowerShell usage, thereby increasing the attack surface for further lateral movement within a network environment where such systems are prevalent.
Mitigation strategies must focus on both immediate remediation and long-term hardening practices. The most direct solution is to apply the latest cumulative updates provided by Microsoft, which address these specific logic flaws in the PowerShell engine. Organizations should also enforce strict application control policies using tools like Windows Defender Application Control or AppLocker to restrict the execution of untrusted scripts regardless of user permissions. Additionally, enabling Constrained Language Mode and restricting script block logging can limit the effectiveness of such exploits even if they are attempted. Regular auditing of PowerShell history and monitoring for anomalous command patterns will further enhance detection capabilities against attackers attempting to abuse these protection mechanism failures.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-250, which refers to execution with unnecessary privileges, as well as CWE-862, involving missing authorization checks in critical security features. In the context of the MITRE ATT&CK framework, this behavior corresponds to techniques such as T1059 Command and Scripting Interpreter abuse or T1068 Exploitation for Privilege Escalation. Understanding these mappings helps security teams prioritize patching efforts and adjust detection rules within their Security Information and Event Management (SIEM) systems to identify similar exploitation attempts across the enterprise infrastructure.