Is CVE-2026-42140 actively exploited?

No active exploitation of CVE-2026-42140 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42140 be exploited remotely?

Yes. CVE-2026-42140 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42140?

CVE-2026-42140 has a CVSS score of 4.4 (MEDIUM).

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MEDIUM

CVE-2026-42140

CWE-918Published: May 4, 2026· Updated: May 7, 2026

4.4

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:6.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42140 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.