# CVE-2026-3100: An improper certificate validation vulnerability was found in the FTP Backup on the ADM.

> Attackers can intercept backup traffic and steal credentials due to improper TLS certificate validation in ASUSTOR ADM FTP backups.

- **Severity:** High 8.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Feb 2026
- **Updated:** 27 Feb 2026
- **Also known as:** GHSA-3224-p867-265f

## What is CVE-2026-3100?

CVE-2026-3100 is a high-severity vulnerability in ASUSTOR ADM, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The FTP Backup on the ADM will not properly strictly enforce TLS certificate verification while connecting to an FTP server using FTPES/FTPS. An improper validated TLS/SSL certificates allows a remote attacker can intercept network traffic to perform a Man-in-the-Middle (MitM) attack, which may intercept, modify, or obtain sensitive information such as authentication credentials and backup data.
Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.ROF1 as well as from ADM 5.0.0 through ADM 5.1.2.RE51.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2026-3100?

It affects 1 product.


Products: Asustor Data Master.

## How do I fix CVE-2026-3100?

No fix has been published for CVE-2026-3100 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3100 being exploited?

There is no known exploitation of CVE-2026-3100 in the wild and no public exploit code.

## Other vulnerabilities in ASUSTOR ADM

- [CVE-2018-12313](https://insights.sbomify.com/CVE-2018-12313/): Command injection in n/a (critical 9.8)
- [CVE-2026-24936](https://insights.sbomify.com/CVE-2026-24936/): An improper input validation vulnerability was found in ADM while joining a AD Domain. (critical 9.5)
- [CVE-2026-6644](https://insights.sbomify.com/CVE-2026-6644/): A command injection vulnerability was found in the PPTP VPN Clients on the ADM (critical 9.4)
- [CVE-2026-3179](https://insights.sbomify.com/CVE-2026-3179/): A path traversal vulnerability was found in the FTP Backup on the ADM. (critical 9.2)
- [CVE-2026-24932](https://insights.sbomify.com/CVE-2026-24932/): An improper certificate validation vulnerability was found in ADM while updating the DDNS settings. (high 8.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3100 and fix it if it is affected.

What it is: CVE-2026-3100 is a high-severity vulnerability in ASUSTOR ADM, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3100 in the wild and no public exploit code.

Affected product: ASUSTOR ADM. 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-2026-3100/ (Markdown: https://insights.sbomify.com/CVE-2026-3100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3100
- OSV: https://osv.dev/vulnerability/CVE-2026-3100

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3100/
Summaries are generated and may contain mistakes; the official description above is the record.