CVE-2026-91949

freerdp: FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass

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Severity

Critical

Red Hat Product Security

9.3

CVSS 3.1

Review impact separately from score.

Published · September 16, 2026

Updated · October 2, 2026

Description

A flaw was found in FreeRDP server. This vulnerability allows unauthenticated attackers to bypass server policies that disable Remote Desktop Services over Transport Layer Security (RDSTLS) connections. By sending incompatible protocol requests and then completing a TLS handshake, attackers can establish RDSTLS connections, thereby circumventing pre-authentication transport restrictions.

Statement

If your RHEL systems only use FreeRDP for outbound client connections, the server-side handshake bypass cannot be exploited against them.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 9.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

CWE-358 · Improperly Implemented Security Check for Standard