CVE-2022-39297: Melistechnology Meliscms

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

MelisCms provides a full CMS for Melis Platform, including templating system, drag'n'drop of plugins, SEO and many administration tools. Attackers can deserialize arbitrary data on affected versions of `melisplatform/melis-cms`, and ultimately leads to the execution of arbitrary PHP code on the system. Conducting this attack does not require authentication. Users should immediately upgrade to `melisplatform/melis-cms` >= 5.0.1. This issue was addressed by restricting allowed classes when deserializing user-controlled data.

Affected products

• Melistechnology Meliscms: before 5.0.1 (fixed in 5.0.1)

Published 2022-10-12. Last modified 2026-06-17.