# CVE-2020-37113: GUnet OpenEclass 1.7.3 E-learning platform - File Upload Extension Bypass

> Authenticated attackers can bypass file extension checks to upload PHP web shells, enabling remote code execution on the server.

- **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:** 3 Feb 2026
- **Updated:** 28 Jul 2026
- **Also known as:** GHSA-fx56-pxgc-fpm7

## What is CVE-2020-37113?

CVE-2020-37113 is a high-severity vulnerability in GUnet OpenEclass, published on 3 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

GUnet OpenEclass 1.7.3 allows authenticated users to bypass file extension restrictions when uploading files. By renaming a PHP file to .php3 or .PhP, an attacker can upload a web shell and execute arbitrary code on the server. This vulnerability enables remote code execution by bypassing the intended file type checks in the exercise submission feature.

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

## Which versions are affected by CVE-2020-37113?

It affects 1 product.


Products: Gunet Open Eclass Platform.

## How do I fix CVE-2020-37113?

No fix has been published for CVE-2020-37113 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-37113 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37113 exists.

## Other vulnerabilities in GUnet OpenEclass

- [CVE-2020-37116](https://insights.sbomify.com/CVE-2020-37116/): GUnet OpenEclass 1.7.3 E-learning platform - phpMyAdmin Remote Access (high 8.7)
- [CVE-2026-24665](https://insights.sbomify.com/CVE-2026-24665/): Open eClass is Vulnerable to Stored Cross-Site Scripting (XSS) via Student Assignment Upload (high 8.7)
- [CVE-2026-24669](https://insights.sbomify.com/CVE-2026-24669/): Open eClass Insecure Password Reset Token Reuse Enables Account Takeover (high 7.8)
- [CVE-2026-24773](https://insights.sbomify.com/CVE-2026-24773/): Open eClass Unauthenticated IDOR Allows Access to Arbitrary User Files (high 7.5)
- [CVE-2020-24381](https://insights.sbomify.com/CVE-2020-24381/): Information disclosure in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-37113 and fix it if it is affected.

What it is: CVE-2020-37113 is a high-severity vulnerability in GUnet OpenEclass, published on 3 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-2020-37113 exists.

Affected product: GUnet OpenEclass. 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-2020-37113/ (Markdown: https://insights.sbomify.com/CVE-2020-37113/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-37113
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-37113
- OSV: https://osv.dev/vulnerability/CVE-2020-37113

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-37113/
Summaries are generated and may contain mistakes; the official description above is the record.