What is CVE-2026-42140?

CVE-2026-42140 is a medium-severity vulnerability in Xwiki-contrib Macro-plantuml, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.4/10. Published 2026-05-04.

How severe is CVE-2026-42140?

Medium severity. CVSS v3 base score is 4.4 out of 10.

SSRF in Xwiki-contrib Macro-plantuml

CVE-2026-42140

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 ser…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (7.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Xwiki-contrib Macro-plantuml — versions < 2.4.1

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

https://github.com/xwiki-contrib/macro-plantuml/security/advisories/GHSA-42fc-7w97-8vrc (x_refsource_CONFIRM)
https://github.com/xwiki-contrib/macro-plantuml/commit/c8b19bda93058794e04c8862fc7ca85c59b5fe5c (x_refsource_MISC)
https://jira.xwiki.org/browse/PLANTUML-25 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-42140?: CVE-2026-42140 is a medium-severity vulnerability in Xwiki-contrib Macro-plantuml, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.4/10. Published 2026-05-04.
How severe is CVE-2026-42140?: Medium severity. CVSS v3 base score is 4.4 out of 10.