CVE-2026-23566 Log Injection in Content Distribution Service UDP Handler
An adjacent network attacker can inject or forge log entries in the TeamViewer DEX Client Content Distribution Service, compromising log integrity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-23566?
CVE-2026-23566 is a medium-severity vulnerability in TeamViewer DEX, published on 29 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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 Branch.log via crafted data sent to the UDP network handler. This can impact log integrity and nonrepudiation.
Weakness: CWE-20
Which versions are affected by CVE-2026-23566?
It affects 1 product.
Products include Teamviewer Digital Employee Experience.
How do I fix CVE-2026-23566?
No fix has been published for CVE-2026-23566 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-23566 being exploited?
There is no known exploitation of CVE-2026-23566 in the wild and no public exploit code.
Other vulnerabilities in TeamViewer DEX
- CVE-2025-44016 File Hash Validation Bypass in NomadBranch.exe
- CVE-2025-64986 Command Injection in 1E-Explorer-TachyonCore-DevicesListeningOnAPort Instruction
- CVE-2025-64987 Command Injection in 1E-Explorer-TachyonCore-CheckSimpleIoC Instruction
- CVE-2025-64988 Command Injection in 1E-Nomad-GetCmContentLocations Instruction
- CVE-2025-64989 Command Injection in 1E-Explorer-TachyonCore-FindFileBySizeAndHash Instruction
Sources
Also known as GHSA-wv29-cpcr-3fpf.