neutrinolabs xrdp up to 0.10.5 AlternateShell os command injection

Summaryinfo

A vulnerability classified as critical was found in neutrinolabs xrdp up to 0.10.5. Affected by this issue is some unknown functionality. Such manipulation of the argument AlternateShell leads to os command injection. This vulnerability is documented as CVE-2026-33145. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in neutrinolabs xrdp up to 0.10.5 and classified as critical. Affected by this issue is an unknown function. The manipulation of the argument AlternateShell with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

xrdp is an open source RDP server. Versions through 0.10.5 allow an authenticated remote user to execute arbitrary commands on the server due to unsafe handling of the AlternateShell parameter in xrdp-sesman. When the AllowAlternateShell setting is enabled (which is the default when not explicitly configured), xrdp accepts a client-supplied AlternateShell value and executes it via /bin/sh -c during session initialization. This results in shell-interpreted execution of unsanitized, user-controlled input. This behavior effectively provides a scriptable remote command execution primitive over RDP within the security context of the authenticated user, occurring prior to normal window manager startup. This can bypass expected session initialization flows and operational assumptions that restrict execution to interactive desktop environments. This issue has been fixed in version 0.10.6.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-33145 since 03/17/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 0.10.6 eliminates this vulnerability.

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Productinfo

Vendor

• neutrinolabs

Name

• xrdp

Version

• 0.10.0
• 0.10.1
• 0.10.2
• 0.10.3
• 0.10.4
• 0.10.5

Website

• Product: https://github.com/neutrinolabs/xrdp/

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