CVE-2026-101880 in Node
Summary
by MITRE • 09/30/2026
OpenClaw Windows Node before 2026.7.1 contains an incorrect authorization vulnerability in the system.run exec-approval policy where ExecShellWrapperParser fails to split commands on pipe operators or extract command substitutions. Connected gateways or agents can bypass approval rules by placing denied commands behind allowed prefixes using pipe operators or command substitution syntax, achieving arbitrary command execution on Windows hosts.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified in OpenClaw Windows Node versions prior to 2026.7.1 represents a critical failure in the enforcement of security policies designed to restrict system-level operations. Specifically, this flaw resides within the exec-approval policy mechanism, which is intended to validate and authorize commands before they are executed on the host machine. The core technical deficiency lies in the ExecShellWrapperParser component, which serves as the gatekeeper for command interpretation. This parser fails to correctly parse shell metacharacters, specifically pipe operators such as the vertical bar character and syntax associated with command substitution like parentheses or dollar signs. By neglecting to split commands on these delimiters or extract embedded sub-commands, the security control operates under a flawed assumption that the initial string provided for approval is identical in execution scope to what will ultimately be processed by the operating system shell.
This architectural oversight allows attackers who have access to connected gateways or agents to bypass authorization rules through command injection techniques. An adversary can construct a malicious payload where an approved, benign command prefix is followed immediately by pipe operators and subsequent denied commands. For instance, if a policy permits running a specific diagnostic tool but prohibits network utilities like curl or wget, the attacker could append a pipe operator after the allowed binary to chain it with the prohibited utility. Because the parser does not recognize this separation of concerns during the approval phase, it grants permission for the initial command while remaining blind to the secondary commands that will be executed in the same process context upon shell interpretation. This results in arbitrary command execution on Windows hosts, effectively neutralizing the protective intent of the exec-approval policy and allowing full control over the system's runtime environment.
The operational impact of this vulnerability is severe, as it undermines a primary defense layer against unauthorized script execution and lateral movement within enterprise environments. By bypassing approval rules, an attacker can execute arbitrary binaries, download additional malware payloads, exfiltrate sensitive data using prohibited network tools, or modify system configurations without triggering alerts associated with policy violations. This capability significantly lowers the barrier for privilege escalation and post-exploitation activities, particularly in scenarios where agents are deployed with elevated privileges to manage endpoints. The ability to chain commands also facilitates complex attack chains that might otherwise be blocked by static allow-lists, thereby expanding the blast radius of any initial compromise achieved through other vectors such as phishing or unpatched application vulnerabilities.
From a classification perspective, this vulnerability aligns closely with CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. The root cause is the failure to properly sanitize and parse input before it interacts with the command shell interpreter. In terms of tactical mapping within the MITRE ATT&CK framework, this behavior corresponds to T1059 Command and Scripting Interpreter, specifically regarding the abuse of shell features for execution evasion. It also relates to T1620 Reflective Code Loading if the injected commands involve dynamic loading techniques, although the primary vector here is direct command injection via policy bypass. The vulnerability highlights a common pitfall in security tool development where input validation occurs at an abstraction layer that does not account for shell-level parsing rules, leading to false negatives in threat detection and prevention systems.
Mitigation strategies must prioritize immediate patching of OpenClaw Windows Node to version 2026.7.1 or later, which addresses the parsing logic within ExecShellWrapperParser. Until patches are applied, administrators should implement compensating controls such as strict application whitelisting at the operating system level using tools like AppLocker or Windows Defender Application Control to restrict execution of unauthorized binaries regardless of policy approvals. Additionally, network segmentation and monitoring for anomalous command chaining patterns in process creation logs can help detect exploitation attempts. Security teams should also review exec-approval policies to ensure they do not rely solely on prefix matching without considering shell metacharacter handling, adopting a defense-in-depth approach that assumes any input-based security control may be bypassed through parsing ambiguities.