# CVE-2021-41646: File upload in n/a

> Attackers can achieve remote code execution by uploading malicious PHP files that bypass image upload filters in the Online Reviewer System.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Oct 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-hmp6-wv7w-5wx2

## What is CVE-2021-41646?

CVE-2021-41646 is a critical vulnerability in n/a, published on 29 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Remote Code Execution (RCE) vulnerability exists in Sourcecodester Online Reviewer System 1.0 by uploading a maliciously crafted PHP file that bypasses the image upload filters..

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2021-41646?

It affects 1 product.


Products: Janobe Online Reviewer System.

## How do I fix CVE-2021-41646?

No fix has been published for CVE-2021-41646 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-41646 being exploited?

There is no known exploitation of CVE-2021-41646 in the wild and no public exploit code.

Public exploit code:

- Remote Code Execution (RCE) vulnerability exists in Sourcecodester Online Reviewer System 1.0 by uploading a maliciously crafted PHP file that bypasses the image upload filters.. (github_poc): https://github.com/hax3xploit/CVE-2021-41646

## Other vulnerabilities in n/a

- [CVE-2021-27130](https://insights.sbomify.com/CVE-2021-27130/): SQL injection in n/a (critical 9.8)
- [CVE-2023-2596](https://insights.sbomify.com/CVE-2023-2596/): SourceCodester Online Reviewer System GET Parameter user-update.php sql injection (medium 6.3)
- [CVE-2026-36919](https://insights.sbomify.com/CVE-2026-36919/): SQL injection in n/a (low 2.7)
- [CVE-2026-36920](https://insights.sbomify.com/CVE-2026-36920/): SQL injection in n/a (low 2.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-41646 and fix it if it is affected.

What it is: CVE-2021-41646 is a critical vulnerability in n/a, published on 29 Oct 2021. 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-2021-41646 in the wild and no public exploit code.

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-2021-41646/ (Markdown: https://insights.sbomify.com/CVE-2021-41646/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-41646
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-41646
- OSV: https://osv.dev/vulnerability/CVE-2021-41646

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-41646/
Summaries are generated and may contain mistakes; the official description above is the record.