Security readout for executives and security teams
Plain-English summary
OpenOLAT had a dangerous import-file parsing flaw that could let a logged-in author run code on the server. It is not reachable by anonymous users, but a compromised or malicious author account could turn LMS access into full system compromise.
Executive priority
Prioritize remediation as high where OpenOLAT supports external authors, partners, or many privileged course creators. The flaw can lead to server code execution, but requires authenticated author access rather than anonymous internet access.
Technical view
CVE-2021-39181 is unsafe deserialization through XStream during prepared XML import, such as course import. A user with OpenOLAT authoring privileges could instantiate arbitrary Java classpath classes, including Spring AOP bean factories, leading to arbitrary code execution. Fixed releases are 15.3.18, 15.5.3, and 16.0.0.
Likely exposure
Exposure is likely limited to OpenOLAT deployments running vulnerable versions before the fixed releases, especially where many users have authoring roles. The source states unregistered users cannot exploit it.
Exploitation context
The bundle reports no KEV listing and provides no evidence of active exploitation. Exploitation requires an OpenOLAT account with the authoring role and a prepared import XML file. Successful exploitation could affect confidentiality, integrity, and availability.
Researcher notes
Focus validation on version, authoring-role exposure, and import workflows. The evidence identifies unsafe XStream deserialization and arbitrary Java class instantiation, but does not provide public exploitation evidence or a workaround beyond upgrade.
Mitigation direction
- Upgrade OpenOLAT to 15.3.18, 15.5.3, 16.0.0, or later.
- Treat role reduction as risk reduction, not a complete workaround.
- Review and minimize users with the authoring role until upgraded.
- Check OpenOLAT vendor guidance for any deployment-specific instructions.
- Prioritize upgrades for internet-accessible or multi-tenant LMS instances.
Validation and detection
- Inventory all OpenOLAT instances and record exact versions.
- Confirm each instance runs 15.3.18, 15.5.3, 16.0.0, or later.
- Review authoring-role assignments for unexpected or stale accounts.
- Check import activity for unexpected course or XML imports.
- Confirm change records show the fixed OpenOLAT release was deployed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-91: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-39181 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/OpenOLAT/OpenOLAT/security/advisories/GHSA-596v-3gwh-2m9wCVE reference · x_refsource_CONFIRM
- https://github.com/OpenOLAT/OpenOLAT/commit/3f219ac457afde82e3be57bc614352ab92c05684CVE reference · x_refsource_MISC
- https://jira.openolat.org/browse/OO-5548CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
XML Injection (aka Blind XPath Injection)
XML Injection (aka Blind XPath Injection) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.