PT-2026-36886 · Xwiki · Plantuml Macro

Lukasz-Rybak · CVE-2026-42140 · Published 2026-05-04 · Updated 2026-05-05

Positive Technologies (AI Summary)

CVSS v3.1

4.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions PlantUML Macro versions prior to 2.4.1

Description PlantUML Macro, used for rendering UML diagrams from textual schemes, contains a Server-Side Request Forgery (SSRF) flaw. The application fails to validate the URL provided through the server parameter, allowing an attacker to specify an internal IP address or a malicious external URL. Consequently, the XWiki server attempts to connect to the supplied URL to render the diagram.

Recommendations Update to version 2.4.1.

Exploit

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-42140

GHSA-42FC-7W97-8VRC

Affected Products

Plantuml Macro

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42140.json · Exploit
• https://osv.dev/vulnerability/GHSA-42fc-7w97-8vrc · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-42140 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42140 · Security Note
• https://github.com/xwiki-contrib/macro-plantuml · Note
• https://github.com/xwiki-contrib/macro-plantuml/security/advisories/GHSA-42fc-7w97-8vrc · Note
• https://github.com/xwiki-contrib/macro-plantuml/commit/c8b19bda93058794e04c8862fc7ca85c59b5fe5c · Note
• https://jira.xwiki.org/browse/PLANTUML-25 · Note
• https://twitter.com/VulmonFeeds/status/2051380613567889464 · Twitter Post
• https://t.me/CVEtracker/52655 · Telegram Post
• https://twitter.com/CVEnew/status/2051361256200634863 · Twitter Post