Stored XSS Affecting net.sourceforge.plantuml:plantuml package, versions [,1.2026.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-NETSOURCEFORGEPLANTUML-14552230
- published15 Jan 2026
- disclosed23 Dec 2025
- creditCatalin Iovita (Snyk Security Research)
Introduced: 23 Dec 2025
CVE-2026-0858 (opens in a new tab)How to fix?
Upgrade net.sourceforge.plantuml:plantuml to version 1.2026.0 or higher.
Overview
Affected versions of this package 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.