CVE-2026-110838

FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass

State: Published
Severity: 8.7 High
Published: Oct 14, 2026
Updated: Oct 16, 2026
Reserved: Oct 14, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	VulnCheck

Weaknesses

CWE-306 Missing Authentication for Critical Function

Affected Products

Product	Versions
FreeRDPFreeRDP	3.0.0 to before 3.32.0Affected 3.32.0Not affected

References

GitHub Security Advisory (GHSA-m998-cvfm-9444)vendor-advisory
VulnCheck Advisory: FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypassthird-party-advisory

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