# CVE-2026-91949

## Summary

- **CVE ID:** CVE-2026-91949
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (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)
- **CWE:** CWE-693
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 17, 2026

## 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 Products

- FreeRDP — FreeRDP (3.0.0)
- FreeRDP — FreeRDP (3.31.0)

## References

- [CNA](https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x7v6-xfx3-52j6)
- [CNA](https://www.vulncheck.com/advisories/freerdp-3.0.0-through-3.30.0-protocol-negotiation-bypass)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.45%
- **EPSS Percentile:** 38.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._