# CVE-2021-47939: Evolution CMS 3.1.6 Authenticated Remote Code Execution via Module Creation

> Authenticated attackers with module creation permissions can execute arbitrary system commands by injecting PHP code into module parameters in Evolution CMS.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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:** 10 May 2026
- **Updated:** 11 May 2026
- **Also known as:** GHSA-w3hh-x22g-mhjw

## What is CVE-2021-47939?

CVE-2021-47939 is a high-severity code injection vulnerability in Evolution CMS, published on 10 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Evolution CMS 3.1.6 contains a remote code execution vulnerability that allows authenticated users with module creation permissions to execute arbitrary system commands by injecting PHP code into module parameters. Attackers can send POST requests to /manager/index.php with malicious PHP code in the 'post' parameter to create modules that execute arbitrary commands when invoked.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2021-47939?


## How do I fix CVE-2021-47939?

No fix has been published for CVE-2021-47939 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47939 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47939 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47939 and fix it if it is affected.

What it is: CVE-2021-47939 is a high-severity code injection vulnerability in Evolution CMS, published on 10 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47939 exists.

Affected product: Evolution CMS. 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-2021-47939/ (Markdown: https://insights.sbomify.com/CVE-2021-47939/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47939
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47939
- OSV: https://osv.dev/vulnerability/CVE-2021-47939

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47939/
Summaries are generated and may contain mistakes; the official description above is the record.