CVE-2020-37113: GUnet OpenEclass 1.7.3 allows authenticated users to bypass file extension restrictions when uploading files

This month

HIGH 8.8DOWNGRADE

CVE-2020-37113 is a high-severity flaw (CVSS 8.8) affecting open eclass platform. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-02-03
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: gunet

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-03 18:16 UTCPublished CVE record published
2026-06-17 03:17 UTCUpdated Record last modified

gunet open eclass platform DOWNGRADE

Affected: 1.7.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.3

1. Check installed version

apt-cache policy open-eclass-platform || rpm -q open-eclass-platform || open-eclass-platform --version

2. No fixed release: DOWNGRADE to a release before 1.7.3 (Debian / Ubuntu)

apt-cache madison open-eclass-platform sudo apt install open-eclass-platform=<VERSION_BEFORE_1.7.3> sudo apt-mark hold open-eclass-platform

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list open-eclass-platform sudo dnf downgrade open-eclass-platform-<VERSION_BEFORE_1.7.3> sudo dnf versionlock add open-eclass-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-37113?

open eclass platform: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-37113 being exploited?

CVE-2020-37113 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-37113 affect?

CVE-2020-37113 affects open eclass platform. Severity is high (CVSS 8.8). 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 vulnera

How urgent is CVE-2020-37113?

Priority 51/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-24774 MEDIUM 4.3 UPGRADE The Open eClass platform (formerly known as GUnet eClass) is a complete course management system
CVE-2026-24773 HIGH 7.5 UPGRADE The Open eClass platform (formerly known as GUnet eClass) is a complete course management system
CVE-2026-24674 MEDIUM 4.7 UPGRADE The Open eClass platform (formerly known as GUnet eClass) is a complete course management system
CVE-2026-24673 MEDIUM 4.3 UPGRADE The Open eClass platform (formerly known as GUnet eClass) is a complete course management system
CVE-2026-24672 HIGH 7.3 UPGRADE The Open eClass platform (formerly known as GUnet eClass) is a complete course management system

References

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