CVE-2026-0858
Medium
Description
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.
SeverityMedium
CVSS6.1
Exploit probability—
ProductPlantuml
PublishedJan 16, 2026
First seenJan 16, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- plantuml plantuml1.2026.0 or later
- net.sourceforge.plantuml:plantuml1.2026.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| plantuml plantuml | v < 1.2026.0 | 1.2026.0 |
| net.sourceforge.plantuml:plantumlMaven | v < 1.2026.0 | 1.2026.0 |
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