What is CVE-2026-23570?

CVE-2026-23570 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-2026-23570?

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

Improper input validation in Microsoft Windows

CVE-2026-23570

A missing validation of a user-controlled value in the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to tamper with log timestamps via crafted UDP Sync command. This could result in forged or nonsensical datetime prefixes and compromising log integrity and forensic correlation.

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

EPSS: 0.007 (49.3th 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

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

psirt@teamviewer.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-23570?: CVE-2026-23570 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-2026-23570?: Medium severity. CVSS v3 base score is 6.5 out of 10.