Vulnerability in Freerdp
CVE-2026-121392
FreeRDP before 3.32.2 contains an improper certificate validation vulnerability in tls_verify_certificate() that accepts Common Name fallback despite non-matching SAN entries and matches IP literals against DNS strings. Man-in-the-middle attackers holding a certificate from a client-trusted CA can bypass server identity checks to intercept RDP sessions, including keystrokes, clipboard, and screen content.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-jq25-3374-4262 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-certificate-identity-validat… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121392?
- CVE-2026-121392 is a high-severity vulnerability in Freerdp, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2026-11-03.
- How severe is CVE-2026-121392?
- High severity. CVSS v3 base score is 7.4 out of 10.