FreeRDP up to 3.29.x RDSTLS libfreerdp/core/rdstls.c rdstls_server_authenticate improper authentication

Summaryinfo

A vulnerability labeled as critical has been found in FreeRDP up to 3.29.x. Affected is the function rdstls_server_authenticate of the file libfreerdp/core/rdstls.c of the component RDSTLS. Executing a manipulation can lead to improper authentication. This vulnerability is tracked as CVE-2026-73241. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in FreeRDP up to 3.29.x and classified as critical. This vulnerability affects the function rdstls_server_authenticate of the file libfreerdp/core/rdstls.c of the component RDSTLS. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.30.0, FreeRDP server-side RDSTLS in libfreerdp/core/rdstls.c accepts an attacker-supplied RDSTLS_TYPE_CAPABILITIES PDU while rdstls_server_authenticate is waiting for RDSTLS_TYPE_AUTHREQ, leaving resultCode at RDSTLS_RESULT_SUCCESS and allowing a remote unauthenticated client to bypass the RedirectionGuid, username, domain, or password checks. This issue is fixed in version 3.30.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-73241 since 08/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 342051 (Amazon Linux 2023 : freerdp, freerdp-devel, freerdp-libs (ALAS2023-2026-2111)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.30.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (342051) and CERT Bund (WID-SEC-2026-2776). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Open Source FreeRDP

Productinfo

Type

• Remote Access Software

Name

• FreeRDP

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23
• 3.24
• 3.25
• 3.26
• 3.27
• 3.28
• 3.29

License

• open-source

Website

• Product: https://github.com/FreeRDP/FreeRDP/

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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