# CVE-2021-47918: Simple CMS 2.1 SQL Injection Vulnerability via Users Module

> Privileged attackers can inject SQL commands via the users module in Simple CMS to compromise the database and web application.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/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:** 1 Feb 2026
- **Updated:** 5 Mar 2026
- **Also known as:** GHSA-h64m-fxq4-m43w

## What is CVE-2021-47918?

CVE-2021-47918 is a high-severity SQL injection vulnerability in Simplephpscripts Simple CMS, published on 1 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Simple CMS 2.1 contains a remote SQL injection vulnerability that allows privileged attackers to inject unfiltered SQL commands in the users module. Attackers can exploit unvalidated input parameters in the admin.php file to compromise the database management system and web application.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2021-47918?

It affects 1 product.


Products: Simplephpscripts Simple Cms Php.

## How do I fix CVE-2021-47918?

No fix has been published for CVE-2021-47918 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47918 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47918 exists.

## Other vulnerabilities in Simplephpscripts Simple CMS

- [CVE-2021-47917](https://insights.sbomify.com/CVE-2021-47917/): Simple CMS 2.1 Persistent Cross-Site Scripting via User Input Parameters (medium 5.1)
- [CVE-2021-47919](https://insights.sbomify.com/CVE-2021-47919/): Simple CMS 2.1 Non-Persistent Cross-Site Scripting via Preview Parameter (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47918 and fix it if it is affected.

What it is: CVE-2021-47918 is a high-severity SQL injection vulnerability in Simplephpscripts Simple CMS, published on 1 Feb 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-2021-47918 exists.

Affected product: Simplephpscripts Simple 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-2021-47918/ (Markdown: https://insights.sbomify.com/CVE-2021-47918/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47918
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47918
- OSV: https://osv.dev/vulnerability/CVE-2021-47918

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47918/
Summaries are generated and may contain mistakes; the official description above is the record.