Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Frentix | Openolat | < 19.1.31 |
Related Weaknesses (CWE)
References
- https://github.com/OpenOLAT/OpenOLAT/security/advisories/GHSA-55qg-vvgj-ffh4MitigationVendor Advisory
FAQ
What is CVE-2026-28228?
CVE-2026-28228 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 rol...
How severe is CVE-2026-28228?
CVE-2026-28228 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-28228?
Check the references section above for vendor advisories and patch information. Affected products include: Frentix Openolat.