CVE-2026-28228: Frentix Openolat

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication. Prior to versions 19.1.31, 20.1.18, and 20.2.5, an authenticated user with the Author role can inject Velocity directives into a reminder email template. When the reminder is processed (either triggered manually or via the daily cron job), the injected directives are evaluated server-side. By chaining Velocity's #set directive with Java reflection, an attacker can instantiate arbitrary Java classes such as java.lang.ProcessBuilder and execute operating system commands with the privileges of the Tomcat process (typically root in containerized deployments). This issue has been patched in versions 19.1.31, 20.1.18, and 20.2.5.

Affected products

• Frentix Openolat: before 19.1.31 (fixed in 19.1.31); from 20.0.0, before 20.1.18 (fixed in 20.1.18); from 20.2.0, before 20.2.5 (fixed in 20.2.5)

Published 2026-03-30. Last modified 2026-06-17.