CVE-2026-91949 — FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass
FreeRDP server versions before 3.31.0 contain a protocol negotiation bypass vulnerability that allows unauthenticated attackers to establish RDSTLS connections despite server po…
Published: 2026-09-15 · CVSS: 9.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7