EUVD-2026-17201CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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Description
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.
Analysis
Server-side template injection in OpenOlat e-learning platform versions prior to 19.1.31, 20.1.18, and 20.2.5 enables authenticated users with Author role to execute arbitrary operating system commands via crafted Velocity directives in reminder email templates. Exploitation requires low-privilege authentication (PR:L) but is network-accessible (AV:N) with low complexity (AC:L), achieving full system compromise (C:H/I:H/A:H). …
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Remediation
Within 24 hours: Inventory all OpenOlat deployments and identify current versions; restrict Author role permissions to limit template editing until patched. Within 7 days: Upgrade to OpenOlat 19.1.31, 20.1.18, 20.2.5, or later; verify upgrade completion in all environments. …
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