CVE-2026-91949

9.2 criticalEPSS 0.6%

Critical (9.2) in freerdp freerdp. EPSS 0.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

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

CVSS 3.1

9.3 critical

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

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 47% of CVEs (scores of 2026-10-31)
CWE: CWE-693
Published: 2026-09-15
Modified: 2026-09-24
Record from: the NVD, synced 2026-10-19

Affected

freerdp:freerdp

References

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

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