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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00263.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Freerdp Subscribe
Freerdp Subscribe

No data.

No data.

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No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m998-cvfm-9444 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-110838 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-110838 cve-icon
https://www.vulncheck.com/advisories/freerdp-shadow-before-3.32.0-pre-authentication-input-injection-via-confirm-active-bypass cve-icon cve-icon cve-icon
History

Fri, 16 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Important

Wed, 14 Oct 2026 23:00:00 +0000

Type Values Removed Values Added
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.
Title FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass
First Time appeared Freerdp
Freerdp freerdp
Weaknesses CWE-306
CPEs cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Vendors & Products Freerdp
Freerdp freerdp
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-16T17:15:12.757Z

Reserved: 2026-10-14T22:11:15.575Z

Link: CVE-2026-110838

cve-icon Vulnrichment

Updated: 2026-10-16T16:46:52.644Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-10-14T23:17:24.023

Modified: 2026-10-16T18:17:33.523

Link: CVE-2026-110838

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-14T22:52:13Z

Links: CVE-2026-110838 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-15T13:00:18Z

Weaknesses