CVE-2026-91949 FreeRDP - Authentication Bypass

FreeRDP server < 3.31.0 contains a protocol negotiation bypass caused by improper handling of incompatible protocol requests, letting unauthenticated attackers establish RDSTLS connections despite server policy, exploit requires no authentication.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.56% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-693

Vendor fix

Update to version 3.31.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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