# CVE-2026-23570: Log timestamp tampering vulnerability in Content Distribution Service

> An adjacent network attacker can tamper with log timestamps in TeamViewer DEX Client, compromising log integrity and forensic correlation.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Jan 2026
- **Updated:** 29 Jan 2026
- **Also known as:** GHSA-wgvc-4m87-rq27

## What is CVE-2026-23570?

CVE-2026-23570 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 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.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-23570?

It affects 1 product.


Products: Teamviewer Digital Employee Experience.

## How do I fix CVE-2026-23570?

No fix has been published for CVE-2026-23570 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23570 being exploited?

There is no known exploitation of CVE-2026-23570 in the wild and no public exploit code.

## Other vulnerabilities in TeamViewer DEX

- [CVE-2025-44016](https://insights.sbomify.com/CVE-2025-44016/): File Hash Validation Bypass in NomadBranch.exe (high 8.8)
- [CVE-2025-64986](https://insights.sbomify.com/CVE-2025-64986/): Command Injection in 1E-Explorer-TachyonCore-DevicesListeningOnAPort Instruction (high 7.2)
- [CVE-2025-64987](https://insights.sbomify.com/CVE-2025-64987/): Command Injection in 1E-Explorer-TachyonCore-CheckSimpleIoC Instruction (high 7.2)
- [CVE-2025-64988](https://insights.sbomify.com/CVE-2025-64988/): Command Injection in 1E-Nomad-GetCmContentLocations Instruction (high 7.2)
- [CVE-2025-64989](https://insights.sbomify.com/CVE-2025-64989/): Command Injection in 1E-Explorer-TachyonCore-FindFileBySizeAndHash Instruction (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23570 and fix it if it is affected.

What it is: CVE-2026-23570 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.
Exploitation: There is no known exploitation of CVE-2026-23570 in the wild and no public exploit code.

Affected product: TeamViewer DEX. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-23570/ (Markdown: https://insights.sbomify.com/CVE-2026-23570/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23570
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23570
- OSV: https://osv.dev/vulnerability/CVE-2026-23570

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23570/
Summaries are generated and may contain mistakes; the official description above is the record.