PT-2026-33487 · Neutrinolabs · Xrdp

Published 2026-04-17 · Updated 2026-04-17 · CVE-2026-32105

NVD

CVSS v4.0

9.3

Critical

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

xrdp is an open source RDP server. In versions through 0.10.5, xrdp does not implement verification for the Message Authentication Code (MAC) signature of encrypted RDP packets when using the "Classic RDP Security" layer. While the sender correctly generates signatures, the receiving logic lacks the necessary implementation to validate the 8-byte integrity signature, causing it to be silently ignored. An unauthenticated attacker with man-in-the-middle (MITM) capabilities can exploit this missing check to modify encrypted traffic in transit without detection. It does not affect connections where the TLS security layer is enforced. This issue has been fixed in version 0.10.6. If users are unable to immediately upgrade, they should configure xrdp.ini to enforce TLS security (security layer=tls) to ensure end-to-end integrity.

Fix

Weakness Enumeration

CWE-354

Related Identifiers

CVE-2026-32105

Affected Products

Xrdp

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-32105 · Security Note
• https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6 · Note
• https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j2jm-c596-c5q3 · Note