CVEvulnerability

CVE-2026-91949

9.2 CRITICAL Published 2026-09-15 Modified 2026-09-24 Official page ↗
Status
Analyzed
Published
2026-09-15
Last modified
2026-09-24
Assigner
[email protected]
CVSS 4.0 ([email protected])
9.2 CRITICAL — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
9.3 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Weaknesses
CWE-693

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.

Affected configurations

• freerdp freerdp (>= 3.0.0 < 3.31.0)

Related

Weakness · CWE (1)

  • CWE-693 Protection Mechanism Failure weakness

References