---
id: CVE-2026-109952
title: >-
  The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected
  PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in
  nego_process_negotiation_response(), allowing a security protocol downgrade
summary: >-
  The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected
  PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in
  nego_process_negotiation_response(), allowing a security protocol downgrade. A
  malicious se…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-757
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T14:17:33.877'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109952'
references:
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qq23-mqmv-pc65'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.0-security-protocol-downgrade-via-negotiation-response
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-13T14:29:01.853Z'
---

## Overview

The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in nego_process_negotiation_response(), allowing a security protocol downgrade. A malicious server or man-in-the-middle can select RDSTLS to override /sec:nla pinning, complete authentication with an all-zero cookie, and receive the user's cleartext password in the Client Info PDU.

## Remediation

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