CVE-2026-0858: Plantuml

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Plantuml Plantuml: before 1.2026.0 (fixed in 1.2026.0)

Published 2026-01-16. Last modified 2026-06-17.