CVE-2026-42140
Medium
Description
PlantUML Macro is a macro for rendering UML diagrams from simple textual schemes. Prior to version 2.4.1, the PlantUML Macro is vulnerable to Server-Side Request Forgery (SSRF). The macro allows users to specify an alternative PlantUML server via the server parameter. However, the application does not validate the supplied URL. An attacker can supply an internal IP address or a malicious external URL. The XWiki server will attempt to connect to this URL to "render" the diagram. This issue has been patched in version 2.4.1.
SeverityMedium
CVSS4.4
Exploit probability—
ProductOrg.xwiki.contrib.plantuml:macro-plantuml-macro
PublishedMay 4, 2026
First seenMay 4, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- org.xwiki.contrib.plantuml:macro-plantuml-macro2.4.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.xwiki.contrib.plantuml:macro-plantuml-macroMaven | v < 2.4.1 | 2.4.1 |
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