SEPTEMBER 17, 2026
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Case File

CVE-2026-91949

CRITICAL · CVSS 9.3 EPSS 0.45% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

FreeRDP server versions prior to 3.31.0 are susceptible to a critical protocol negotiation bypass vulnerability, enabling unauthenticated attackers to establish RDSTLS connections even when server policies prohibit them. This flaw allows attackers to exploit incompatible protocol requests to bypass pre-authentication transport restrictions, potentially leading to unauthorized access. Organizations utilizing affected FreeRDP server versions should prioritize immediate updates to mitigate this severe risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-91949
Severity
CRITICAL
CVSS
9.3
EPSS
0.45%

Original NVD Description

FreeRDP server versions before 3.31.0 contain a protocol negotiation bypass vulnerability that allows unauthenticated attackers to establish RDSTLS connections despite server policy disabling them. Attackers can send incompatible protocol requests, receive negotiation failures, then complete TLS handshake and enter RDSTLS to bypass pre-authentication transport restrictions.