CVE-2026-55626 xrdp: No authentication required with Xvnc backend on RHEL 9
A local authenticated attacker can bypass session isolation in xrdp with Xvnc backend to view or control other users' desktop sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55626?
CVE-2026-55626 is a high-severity authentication bypass vulnerability in neutrinolabs xrdp, published on 20 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
xrdp is an open source RDP server. In versions 0.10.6 and prior, when an authenticated user session is initialized using the Xvnc backend over UNIX domain sockets, the Xvnc process is launched with insufficient authentication mechanisms. A local authenticated attacker could exploit this vulnerability to bypass intended session isolation, allowing them to unauthorizedly view or control the active desktop sessions of other users on the same system. Users using other backends, such as xorgxrdp or Xvnc over TCP sockets, are not affected. This issue has been fixed in version 0.10.6.1.
Which versions are affected by CVE-2026-55626?
It affects 1 product.
Products include Neutrinolabs Xrdp.
How do I fix CVE-2026-55626?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-55626 being exploited?
There is no known exploitation of CVE-2026-55626 in the wild and no public exploit code.
Other vulnerabilities in neutrinolabs xrdp
- CVE-2026-41252 xrdp: lib_palette_update Heap Buffer Overflow & RCE
- CVE-2026-32105 xrdp: RDP MAC signature (dataSignature) never verified on receive — integrity bypass in non-TLS mode
- CVE-2026-44178 xrdp: Channel Data Forwarding Fixed-Size Buffer Overflow
- CVE-2026-32107 xrdp: Fail-open privilege drop in sesexec — child processes may execute as root if setuid fails
- CVE-2026-33689 xrdp: Pre-authentication out-of-bounds reads in channel parsers
Sources
Also known as DEBIAN-CVE-2026-55626, GHSA-m3xx-cpc4-982r, UBUNTU-CVE-2026-55626.