What’s Vulnerable › Vulnerabilities

CVE-2026-0858

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-16 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• net.sourceforge.plantuml:plantuml: before 1.2026.0 — fixed in 1.2026.0

How to fix

Upgrade to a fixed version: net.sourceforge.plantuml:plantuml 1.2026.0. Check the vendor advisory for mitigations.

References

• https://github.com/plantuml/plantuml/commit/6826315db092d2e432aeab1a0894e08017c6e4bd
• https://github.com/plantuml/plantuml/releases/tag/v1.2026.0
• https://security.snyk.io/vuln/SNYK-JAVA-NETSOURCEFORGEPLANTUML-14552230

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