CVE-2026-110838

FreeRDP shadow server from 3.0.0 before 3.32.0 dispatches input PDUs during the Confirm Active state before authentication, allowing unauthenticated attackers to inject keyboard input. Attackers can negotiate TLS-only RDP and send an input PDU without Confirm Active to inject synthetic keystrokes into the host user's X11 session via XTEST.

Score

CVSS 4.0 8.7 High

Status

Analyzed - disclosure@vulncheck.com

Published

2026-10-14

Last modified

2026-10-23

Weaknesses

CWE-306

Affected products

• Freerdp (Freerdp)

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m998-cvfm-9444
• https://www.vulncheck.com/advisories/freerdp-shadow-before-3.32.0-pre-authentication-input-injection-via-confirm-active…