What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-03 · updated 2026-06-17
• Weakness: CWE-434

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.

Affected products

• gunet openeclass: 1.7.3

References

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

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