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CVE-2026-42140— Server-Side Request Forgery (SSRF) in PlantUML Macro via 'server' parameter

Quick assessment

Affected
xwiki-contrib macro-plantuml
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PlantUML Macro是XWiki Contrib开源的一个从文本定义生成图表图像的工具。 PlantUML Macro 2.4.1之前版本存在代码问题漏洞，该漏洞源于未验证服务器参数提供的URL，可能导致服务端请求伪造攻击。

CVSS 4.4 · Medium EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
xwiki-contrib macro-plantuml < 2.4.1 affected
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I. Basic Information for CVE-2026-42140

Vulnerability Information
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Vulnerability Title
Server-Side Request Forgery (SSRF) in PlantUML Macro via 'server' parameter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
PlantUML Macro 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PlantUML Macro是XWiki Contrib开源的一个从文本定义生成图表图像的工具。 PlantUML Macro 2.4.1之前版本存在代码问题漏洞，该漏洞源于未验证服务器参数提供的URL，可能导致服务端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
xwiki-contrib macro-plantuml < 2.4.1 -

II. Public POCs for CVE-2026-42140

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III. Intelligence Information for CVE-2026-42140

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Patches & Fixes for CVE-2026-42140 (1)

Vendor Advisories for CVE-2026-42140 (2)

IV. Related Vulnerabilities

Same vendor: xwiki-contrib
Same weakness: CWE-918

V. Comments for CVE-2026-42140

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