What is CVE-2026-110838?

CVE-2026-110838 is a high-severity vulnerability in Freerdp, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-10-14.

How severe is CVE-2026-110838?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Freerdp

CVE-2026-110838

FreeRDP shadow server from 3.0.0 before 3.32.0 dispatches input PDUs during the Confirm Active state before authentication, allowing unauthenticated attackers to inject keyboard input. Attackers can negotiate TLS-only RDP and send an input PDU without Confirm Active to inject synthetic keystrokes into the host user's X11 session via XTEST.

Vulnerability class: Broken Authentication

Published 2026-10-14 · last modified 2026-10-15.

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

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

Freerdp

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-m998-cvfm-9444 (vendor-advisory)
www.vulncheck.com/advisories/freerdp-shadow-before-3.32.0-pre-authentication-in… (third-party-advisory)

Frequently asked questions

What is CVE-2026-110838?: CVE-2026-110838 is a high-severity vulnerability in Freerdp, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-10-14.
How severe is CVE-2026-110838?: High severity. CVSS v3 base score is 7.5 out of 10.