plantuml 1.2022.4/1.2022.5/1.2023.9 GraphViz Diagram cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in plantuml. Affected by this vulnerability is an unknown functionality of the component GraphViz Diagram Handler. Performing a manipulation results in cross site scripting. This vulnerability is reported as CVE-2026-0858. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in plantuml. This affects an unknown functionality of the component GraphViz Diagram Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

Versions of the package net.sourceforge.plantuml:plantuml before 1.2026.0 are vulnerable to Stored XSS due to insufficient sanitization of interactive attributes in GraphViz diagrams. As a result, a crafted PlantUML diagram can inject malicious JavaScript into generated SVG output, leading to arbitrary script execution in the context of applications that render the SVG.

The advisory is shared at security.snyk.io. This vulnerability is uniquely identified as CVE-2026-0858 since 01/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.2026.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 6826315db092d2e432aeab1a0894e08017c6e4bd is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• plantuml

Version

• 1.2022.4
• 1.2022.5
• 1.2023.9

License

• open-source

Website

• Product: https://github.com/plantuml/plantuml/

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