CVE-2021-39181: high-severity vulnerability in OpenOLAT
Unsafe Deserialization of User Data Using XStream
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 1.9%
OpenOlat is a web-based learning management system (LMS). Prior to version 15.3.18, 15.5.3, and 16.0.0, using a prepared import XML file (e.g. a course) any class on the Java classpath can be instantiated, including spring AOP bean factories. This can be used to execute code arbitrary code by the attacker. The attack requires an OpenOlat user account with the authoring role. It can not be exploited by unregistered users. The problem is fixed in versions 15.3.18, 15.5.3, and 16.0.0. There are no known workarounds aside from upgrading.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
OpenOLAT · OpenOLATRelated CVEs — OpenOLAT
In the same product, most dangerous first.
CVE-2021-39180HIGHPath Traversal in Archive Handling Leading to Code ExecutionEPSS 2.4%CVE-2021-41242HIGHPath Traversal in some REST methods leading to file upload to arbitrary placesEPSS 1.5%CVE-2021-41152HIGHPath Traversal in Folder Component Leading to Local File InclusionEPSS 1.2%CVE-2024-28198MEDIUMXML external entity (XXE) injection in OpenOLATEPSS 0.4%CVE-2026-28228HIGHOpenOLAT: Server-Side Template Injection (SSTI) in Velocity templates allows Remote Code ExecutionEPSS 0.4%CVE-2026-31946CRITICALOpenOLAT: Authentication bypass via forged JWT in OIDC implicit flowEPSS 0.2%