CVE-2023-1728: Unrestricted Upload of File with Dangerous Type in Fernus LMS

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-04-04 · updated 2026-06-17
Weakness: CWE-434

Description

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.

Affected products

Fernus Learning Management Systems: before 23.04.03 — fixed in 23.04.03

How to fix

Upgrade to a fixed version: Fernus Learning Management Systems 23.04.03. Check the vendor advisory for mitigations.

References

https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-23-0194
https://www.usom.gov.tr/bildirim/tr-23-0194
https://www.usom.gov.tr/bildirim/tr-23-0194

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