# CVE-2026-18186: A stored format string vulnerability was found in the FTP Backup on the ADM

> An authenticated attacker can exploit a stored format string vulnerability in FTP Backup to disclose memory or cause denial of service.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jul 2026
- **Updated:** 4 Aug 2026
- **Also known as:** GHSA-5hfx-gvvr-p6xh

## What is CVE-2026-18186?

CVE-2026-18186 is a high-severity vulnerability in ASUSTOR Inc. ADM, published on 30 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A stored format string vulnerability was found in the FTP Backup on the ADM. The vulnerability occurs because user-controlled backup configuration data may be written into a task log and later processed through an unsafe format string operation. An authenticated attacker can exploit this issue to disclose memory information or cause denial of service of the affected CGI process.
Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well as from ADM 5.0.0 through ADM 5.1.3.RI81.

Weakness: CWE-134 (Use of Externally-Controlled Format String)

## Which versions are affected by CVE-2026-18186?

It affects 1 product.


Products: Asustor Data Master.

## How do I fix CVE-2026-18186?

No fix has been published for CVE-2026-18186 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-18186 being exploited?

There is no known exploitation of CVE-2026-18186 in the wild and no public exploit code.

## Other vulnerabilities in ASUSTOR Inc. 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-2026-18186 and fix it if it is affected.

What it is: CVE-2026-18186 is a high-severity vulnerability in ASUSTOR Inc. ADM, published on 30 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-18186 in the wild and no public exploit code.

Affected product: ASUSTOR Inc. 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-2026-18186/ (Markdown: https://insights.sbomify.com/CVE-2026-18186/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-18186
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18186
- OSV: https://osv.dev/vulnerability/CVE-2026-18186

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-18186/
Summaries are generated and may contain mistakes; the official description above is the record.