---
id: "CVE-2026-121392"
kind: "vulnerability"
aliases: ["CVE-2026-121392"]
title: "FreeRDP: certificate check accepts wrong server names, enabling interception of RDP sessions"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["freerdp", "package", "rdp", "remote-desktop"]
not_affected_if: ["freerdp-3.32.2-or-later", "no-rdp-clients"]
published_at: "2026-11-03T15:17:26+00:00"
first_seen_at: "2026-11-03T15:21:57+00:00"
updated_at: "2026-11-03T15:22:35+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121392", "first_seen_at": "2026-11-03T15:21:57+00:00"}]
---

# FreeRDP: certificate check accepts wrong server names, enabling interception of RDP sessions

FreeRDP before 3.32.2 wrongly accepts a server certificate whose Common Name is used despite non-matching Subject Alternative Names, and matches IP addresses against DNS names. An attacker holding a certificate from a CA the client trusts can man-in-the-middle RDP sessions and read keystrokes, clipboard and screen content.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the FreeRDP version in use with `xfreerdp /version` or the package manager, and compare against `3.32.2`.
- Look for FreeRDP builds or embedded copies in remote-desktop clients and applications that link the library.

## Fix

- FreeRDP: move to `3.32.2` or later.

## Timeline

- 2026-11-03T15:21:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121392

## Documents

- [advisory] Vendor advisory: github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-jq25-3374-4262
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/freerdp-before-3.32.2-certificate-identity-validation-bypass-via-tls-verify-certificate

## From the sources

FreeRDP before 3.32.2 contains an improper certificate validation vulnerability in tls_verify_certificate() that accepts Common Name fallback despite non-matching SAN entries and matches IP literals against DNS strings. Man-in-the-middle attackers holding a certificate from a client-trusted CA can bypass server identity checks to intercept RDP sessions, including keystrokes, clipboard, and screen content.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_