CVE-2023-1728: Unrestricted Upload of File with Dangerous Type vulnerability in Fernus Informatics LMS allows OS Command Inje

Q: How do I fix CVE-2023-1728?

learning management systems: upgrade to 23.04.03. Exact commands for each OS are on this page.

Q: Is CVE-2023-1728 being exploited?

CVE-2023-1728 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-1728 affect?

CVE-2023-1728 affects learning management systems. Severity is critical (CVSS 9.8). Unrestricted Upload of File with Dangerous Type vulnerability in Fernus Informatics LMS allows OS Command Injection, Server Side Include (SSI) Injection. This issue affects LMS: before 23.04.03.

Q: How urgent is CVE-2023-1728?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-1728 is a critical-severity flaw (CVSS 9.8) affecting learning management systems. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unrestricted Upload of File with Dangerous Type vulnerability in Fernus Informatics LMS allows OS Command Injection, Server Side Include (SSI) Injection. This issue affects LMS: before 23.04.03.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-434
Published	2023-04-04
Last modified	2026-06-17

Publisher (CNA): Computer Emergency Response Team of the Republic of Turkey · Vendor: fernus

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

Am I affected?

Timeline

2023-04-04 09:15 UTCPublished CVE record published
2026-06-17 05:28 UTCUpdated Record last modified

fernus learning management systems UPGRADE

Affected: < 23.04.03

Fixed in: 23.04.03

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy learning-management-systems || rpm -q learning-management-systems || learning-management-systems --version

2. UPGRADE to 23.04.03 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade learning-management-systems

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade learning-management-systems

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2023-1728?

learning management systems: upgrade to 23.04.03. Exact commands for each OS are on this page.

Is CVE-2023-1728 being exploited?

CVE-2023-1728 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-2023-1728 affect?

CVE-2023-1728 affects learning management systems. Severity is critical (CVSS 9.8). Unrestricted Upload of File with Dangerous Type vulnerability in Fernus Informatics LMS allows OS Command Injection, Server Side Include (SSI) Injection. This issue affects LMS: before 23.04.03.

How urgent is CVE-2023-1728?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

References

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