CVE-2026-42140: CWE-918: Server-Side Request Forgery (SSRF) in xwiki-contrib macro-plantuml
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.
AI Analysis
Technical Summary
The xwiki-contrib macro-plantuml before version 2.4.1 contains an SSRF vulnerability (CWE-918) due to lack of validation on the user-supplied 'server' parameter that specifies the PlantUML server URL. This allows an attacker with limited privileges and user interaction to cause the server to make HTTP requests to arbitrary URLs, potentially internal network addresses or malicious external sites. The vulnerability has a CVSS 3.1 base score of 4.4 (medium severity) and was published on May 4, 2026. The issue is patched in version 2.4.1.
Potential Impact
Exploitation of this SSRF vulnerability could allow an attacker to make the XWiki server perform unauthorized HTTP requests to internal or external systems. The impact includes limited confidentiality and integrity loss, with no direct availability impact. The CVSS vector indicates the attack requires network access, high attack complexity, low privileges, and user interaction, with partial confidentiality and integrity impact.
Mitigation Recommendations
Upgrade the xwiki-contrib macro-plantuml component to version 2.4.1 or later where this SSRF vulnerability is patched. Since the vendor advisory confirms the fix in 2.4.1, applying this official update fully mitigates the issue. No other mitigations are specified or required.
CVE-2026-42140: CWE-918: Server-Side Request Forgery (SSRF) in xwiki-contrib macro-plantuml
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.
CVSS v3.1
Score 4.4medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The xwiki-contrib macro-plantuml before version 2.4.1 contains an SSRF vulnerability (CWE-918) due to lack of validation on the user-supplied 'server' parameter that specifies the PlantUML server URL. This allows an attacker with limited privileges and user interaction to cause the server to make HTTP requests to arbitrary URLs, potentially internal network addresses or malicious external sites. The vulnerability has a CVSS 3.1 base score of 4.4 (medium severity) and was published on May 4, 2026. The issue is patched in version 2.4.1.
Potential Impact
Exploitation of this SSRF vulnerability could allow an attacker to make the XWiki server perform unauthorized HTTP requests to internal or external systems. The impact includes limited confidentiality and integrity loss, with no direct availability impact. The CVSS vector indicates the attack requires network access, high attack complexity, low privileges, and user interaction, with partial confidentiality and integrity impact.
Mitigation Recommendations
Upgrade the xwiki-contrib macro-plantuml component to version 2.4.1 or later where this SSRF vulnerability is patched. Since the vendor advisory confirms the fix in 2.4.1, applying this official update fully mitigates the issue. No other mitigations are specified or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-24T17:15:21.834Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f8dca1cbff5d86103c0143
Added to database: 5/4/2026, 5:51:29 PM
Last enriched: 5/4/2026, 6:06:49 PM
Last updated: 6/18/2026, 3:42:40 PM
Views: 73
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