RCE in Neutrinolabs Xrdp
CVE-2026-33145
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.004 (28.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Neutrinolabs Xrdp — versions < 0.10.6
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-33145?
- CVE-2026-33145 is a medium-severity vulnerability in Neutrinolabs Xrdp, classified under OS Command Injection. CVSS score: 6.3/10. Published 2026-04-17.
- How severe is CVE-2026-33145?
- Medium severity. CVSS v3 base score is 6.3 out of 10.