# CVE-2020-13978: Command injection in n/a

> Administrators can execute arbitrary OS commands via the Theme Module's Edit Chunk feature, which allows modifying PHP files.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Jun 2020
- **Updated:** 27 Aug 2024
- **Also known as:** GHSA-2cfh-cfhm-pm58

## What is CVE-2020-13978?

CVE-2020-13978 is a high-severity command injection vulnerability in n/a, published on 9 Jun 2020. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Monstra CMS 3.0.4 allows an attacker, who already has administrative access to modify .chunk.php files on the Edit Chunk screen, to execute arbitrary OS commands via the Theme Module by visiting the admin/index.php?id=themes&action=edit_chunk URI. NOTE: there is no indication that the Edit Chunk feature was intended to prevent an administrator from using PHP's exec feature

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2020-13978?

It affects 1 product.


Products: Monstra Monstra Cms.

## How do I fix CVE-2020-13978?

No fix has been published for CVE-2020-13978 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-13978 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-13978 exists.

## Other vulnerabilities in n/a

- [CVE-2018-11678](https://insights.sbomify.com/CVE-2018-11678/): Security feature bypass in n/a (critical 9.8)
- [CVE-2025-69906](https://insights.sbomify.com/CVE-2025-69906/): File upload in n/a (high 8.8)
- [CVE-2020-23219](https://insights.sbomify.com/CVE-2020-23219/): Code injection in n/a (high 8.8)
- [CVE-2020-20691](https://insights.sbomify.com/CVE-2020-20691/): File upload in n/a (medium 6.5)
- [CVE-2018-11227](https://insights.sbomify.com/CVE-2018-11227/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-13978 and fix it if it is affected.

What it is: CVE-2020-13978 is a high-severity command injection vulnerability in n/a, published on 9 Jun 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-13978 exists.

Affected product: n/a. 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-2020-13978/ (Markdown: https://insights.sbomify.com/CVE-2020-13978/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13978
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13978
- OSV: https://osv.dev/vulnerability/CVE-2020-13978

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-13978/
Summaries are generated and may contain mistakes; the official description above is the record.