What is CVE-2026-23566?

CVE-2026-23566 is a medium-severity vulnerability in Microsoft Windows, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-01-29.

How severe is CVE-2026-23566?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Microsoft Windows

CVE-2026-23566

A vulnerability in TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an attacker on the adjacent network to inject, tamper with, or forge log entries in \Nomad B…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.002 (6.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Microsoft Windows
Teamviewer Dex — versions 0
Teamviewer Digital_employee_experience

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

psirt@teamviewer.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-23566?: CVE-2026-23566 is a medium-severity vulnerability in Microsoft Windows, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-01-29.
How severe is CVE-2026-23566?: Medium severity. CVSS v3 base score is 6.5 out of 10.