Stored XSS Vulnerability in PlantUML by SourceForge
CVE-2026-0858

5.1MEDIUM

Key Information:

Vendor

SourceForge

Status
Net.sourceforge.plantuml:plantuml
Vendor
CVE Published:
16 January 2026

What is CVE-2026-0858?

Certain versions of PlantUML prior to 1.2026.0 are exposed to a Stored XSS vulnerability stemming from inadequate sanitization of interactive attributes in GraphViz diagrams. This flaw permits an attacker to craft a PlantUML diagram that injects malicious JavaScript into the generated SVG output. If rendered within affected applications, this can result in the execution of arbitrary scripts, potentially compromising user data and application integrity.

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Affected Version(s)

net.sourceforge.plantuml:plantuml 0 < 1.2026.0

References

https://security.snyk.io/vuln/SNYK-JAVA-NETSOURCEFORGEPLA...
https://github.com/plantuml/plantuml/commit/6826315db092d...
https://github.com/plantuml/plantuml/releases/tag/v1.2026.0

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Catalin Iovita (Snyk Security Research)
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