Server-Side Request Forgery (SSRF) in PlantUML Macro via 'server' parameter

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Summary

CVECVE-2026-42140
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-04 18:16:31 UTC
Updated2026-05-07 15:43:39 UTC
DescriptionPlantUML 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.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.000250000 probability, percentile 0.071330000 (date 2026-05-08)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Xwiki-contrib Macro-plantuml affected < 2.4.1 Not specified

References

ReferenceSourceLinkTags
github.com/xwiki-contrib/macro-plantuml/commit/c8b19bda93058794e04c8862f... [email protected] github.com
github.com/xwiki-contrib/macro-plantuml/security/advisories/GHSA-42fc-7w... [email protected] github.com
jira.xwiki.org/browse/PLANTUML-25 [email protected] jira.xwiki.org
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