High [CVE-2026-73241] Authentication bypass via incorrect RDSTLS PDU handling
This high-severity Red Hat Linux advisory covers CVE-2026-73241 affecting Red Hat Enterprise Linux 10, Red Hat package: freerdp.
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Summary
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. By sending a crafted capabilities PDU instead of the expected authentication request, an attacker can gain an authenticated session without valid credentials.
An Important flaw in FreeRDP 3.0+ allows remote, unauthenticated attackers to bypass authentication and gain session access. This vulnerability only affects servers explicitly configured with the non-default RdstlsSecurity = TRUE setting.
Because RDSTLS was introduced in version 3.0, RHEL 9 and older releases are completely unaffected. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-287. Affected Red Hat products: Red Hat Enterprise Linux 10.
Red Hat fixing advisory: RHSA-2026:61378.
Affected products named by the advisory: Red Hat package: freerdp.
- < 3.30.0
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
- 3.30.0
- freerdp-2:3.10.3-12.el10_2.10
- RHSA-2026:61378
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
Mitigation checklist
- Do not enable RDSTLS server authentication (RdstlsSecurity); it is disabled by default. If FreeRDP is deployed as an RDP server with RDSTLS enabled, disable RdstlsSecurity
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
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