---
id: CVE-2026-110838
title: >-
  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
summary: >-
  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 inp…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-306
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T23:17:24.023'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110838'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m998-cvfm-9444'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-shadow-before-3.32.0-pre-authentication-input-injection-via-confirm-active-bypass
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-15T00:02:07.173Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.