CVE-2026-33145
Description
A flaw was found in xrdp. An authenticated remote user can exploit this vulnerability due to the unsafe handling of the AlternateShell parameter in xrdp-sesman. When the AllowAlternateShell setting is enabled, xrdp executes client-supplied AlternateShell values via /bin/sh -c during session initialization without proper sanitization. This allows an attacker to execute arbitrary commands on the server within the security context of the authenticated user, potentially bypassing normal session restrictions.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability,Non-Repudiation
Technical Impact: Execute Unauthorized Code or Commands; DoS: Crash, Exit, or Restart; Read Files or Directories; Modify Files or Directories; Read Application Data; Modify Application Data; Hide Activities
Attackers could execute unauthorized operating system commands, which could then be used to disable the product, or read and modify data for which the attacker does not have permissions to access directly. Since the targeted application is directly executing the commands instead of the attacker, any malicious activities may appear to come from the application or the application's owner.
Frequently Asked Questions
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