CVE-2026-55626

Name	CVE-2026-55626
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
xrdp (PTS)	bullseye	0.9.21.1-1~deb11u1	vulnerable
	bullseye (security)	0.9.21.1-1~deb11u3	vulnerable
	bookworm, bookworm (security)	0.9.21.1-1+deb12u2	fixed
	trixie (security), trixie	0.10.1-3.1+deb13u1	fixed
	sid	0.10.6.1-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
xrdp	source	experimental	0.10.6.1-1
xrdp	source	bookworm	(not affected)
xrdp	source	trixie	(not affected)
xrdp	source	(unstable)	0.10.6.1-2

Notes

[trixie] - xrdp <not-affected> (Vulnerable code introduced later)
[bookworm] - xrdp <not-affected> (Vulnerable code introduced later)
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-m3xx-cpc4-982r