CVE-2026-67294

MEDIUM 5.9

FreeRDP before 3.29.0 TLS Certificate EKU Bypass

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509_utils_verify(), when server-purpose (X509_PURPOSE_SSL_SERVER) verification fails, the code falls back to client-purpose and any-purpose verification, so a trusted, hostname-matching certificate valid only for clientAuth can be accepted as the RDP server certificate. In environments relying on EKU separation between client and server certificates, this allows a clientAuth-only certificate issued by a trusted CA to bypass server certificate purpose validation.

CWE	CWE-295
Vendor	freerdp
Product	freerdp
Published	Aug 1, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

FreeRDP / FreeRDP

0 < 3.29.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-89c6-jjrw-96h4 github.com: https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f vulncheck.com: https://www.vulncheck.com/advisories/freerdp-before-tls-certificate-eku-bypass

Credits

🔍 1121984919