# CVE-2018-9921: Path traversal in n/a

> An attacker can determine the existence of files and directories outside the web root and verify file contents via checksums in CMS Made Simple.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Apr 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-w7x9-w245-5v98

## What is CVE-2018-9921?

CVE-2018-9921 is a medium-severity path traversal vulnerability in Cmsmadesimple Cms Made Simple, published on 23 Apr 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In CMS Made Simple 2.2.7, a Directory Traversal issue makes it possible to determine the existence of files and directories outside the web-site installation directory, and determine whether a file has contents matching a specified checksum. The attack uses an admin/checksum.php?__c= request.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2018-9921?

It affects 1 product.


Products: Cmsmadesimple Cms Made Simple.

## How do I fix CVE-2018-9921?

No fix has been published for CVE-2018-9921 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-9921 being exploited?

There is no known exploitation of CVE-2018-9921 in the wild and no public exploit code.

## Other vulnerabilities in Cmsmadesimple Cms Made Simple

- [CVE-2010-4663](https://insights.sbomify.com/CVE-2010-4663/): Other in n/a (critical 10.0)
- [CVE-2024-1527](https://insights.sbomify.com/CVE-2024-1527/): Unrestricted Upload of File with Dangerous Type in CMS Made Simple (critical 9.8)
- [CVE-2018-10081](https://insights.sbomify.com/CVE-2018-10081/): Auth bypass in n/a (critical 9.8)
- [CVE-2018-10085](https://insights.sbomify.com/CVE-2018-10085/): Deserialization in n/a (critical 9.8)
- [CVE-2017-1000453](https://insights.sbomify.com/CVE-2017-1000453/): Code injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-9921 and fix it if it is affected.

What it is: CVE-2018-9921 is a medium-severity path traversal vulnerability in Cmsmadesimple Cms Made Simple, published on 23 Apr 2018. 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-2018-9921 in the wild and no public exploit code.

Affected product: Cmsmadesimple Cms Made Simple. 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-2018-9921/ (Markdown: https://insights.sbomify.com/CVE-2018-9921/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-9921
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-9921
- OSV: https://osv.dev/vulnerability/CVE-2018-9921

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-9921/
Summaries are generated and may contain mistakes; the official description above is the record.