How to fix CVE-2020-37113?

Within 24 hours: Inventory all Open Eclass Platform instances and their versions; disable file upload functionality if operationally feasible; implement network access controls restricting upload endpoints. Within 7 days: Deploy Web Application Firewall (WAF) rules to block suspicious file uploads; enforce strict file type validation and storage outside webroot; enable comprehensive logging of upload activities. Within 30 days: Migrate to an unaffected platform version or alternative learning management system; conduct forensic audit for evidence of exploitation; implement file integrity monitoring.

Is PHP affected by CVE-2020-37113?

Open Eclass Platform versions 1.7.3 and earlier contain a critical file upload vulnerability that allows attackers to upload and execute malicious files, potentially compromising educational institutions' systems and student/faculty data.

CVE-2020-37113

HIGH

2026-02-03 [email protected]

8.8

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 12, 2026 - 18:33 vuln.today

Public exploit code

CVE Published

Feb 03, 2026 - 18:16 nvd

HIGH 8.8

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.

Analysis

Open Eclass Platform versions up to 1.7.3 is affected by unrestricted upload of file with dangerous type (CVSS 8.8).

Technical Context

This vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affects Open Eclass Platform. 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

Vendor: Gunet. Product: Open Eclass Platform. Versions: up to 1.7.3.

Remediation

Monitor vendor advisories for a patch. Validate file types by content. Store uploads outside web root. Restrict network access to the affected service where possible.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.2

CVSS: +44

POC: +20

CVE-2020-37113 vulnerability details – vuln.today

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CVE-2020-37113

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CVE-2020-37113

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