Auth bypass in Freerdp
CVE-2026-73241
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Freerdp — versions < 3.30.0
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rqgv-grx4-xm6x (Exploit, Mitigation, Vendor Advisory)
- github.com/FreeRDP/FreeRDP/pull/13065 (Patch, Issue Tracking)
- github.com/FreeRDP/FreeRDP/commit/b05a9510787c83c87ffc5fa8d7cc9f06ed971695 (Patch)
- github.com/FreeRDP/FreeRDP/releases/tag/3.30.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-73241?
- CVE-2026-73241 is a high-severity vulnerability in Freerdp, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-08-11.
- How severe is CVE-2026-73241?
- High severity. CVSS v3 base score is 7.5 out of 10.