PT-2026-5253 · Teamviewer · Teamviewer Dex Client+1

Published 2026-01-29 · Updated 2026-01-29 · CVE-2026-23566

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions TeamViewer DEX Client (former 1E Client) versions prior to 26.1

Description A flaw exists in the TeamViewer DEX Client Content Distribution Service (NomadBranch.exe) that could allow an attacker on the adjacent network to manipulate log entries within the Nomad Branch.log file. Specifically, the attacker can inject, tamper with, or forge log entries by sending crafted data to the UDP network handler. This impacts the integrity and nonrepudiation of logs.

Recommendations Update TeamViewer DEX Client (former 1E Client) to version 26.1 or later.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2026-01100

CVE-2026-23566

Affected Products

1E Client

Teamviewer Dex Client

References · 7

• https://osv.dev/vulnerability/CVE-2026-23566 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23566 · Security Note
• https://bdu.fstec.ru/vul/2026-01100 · Security Note
• https://teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001 · Vendor Advisory
• https://t.me/cveNotify/150245 · Telegram Post
• https://twitter.com/CVEnew/status/2016805042289070175 · Twitter Post
• https://t.me/CVEtracker/43222 · Telegram Post