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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.

PUBLISHED Reserved 2026-01-12 | Published 2026-01-16 | Updated 2026-01-16 | Assigner snyk




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:P
MEDIUM: 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P

Problem types

Stored XSS

Credits

Catalin Iovita (Snyk Security Research)

References

security.snyk.io/...NYK-JAVA-NETSOURCEFORGEPLANTUML-14552230

github.com/...ommit/6826315db092d2e432aeab1a0894e08017c6e4bd

github.com/plantuml/plantuml/releases/tag/v1.2026.0

cve.org (CVE-2026-0858)

nvd.nist.gov (CVE-2026-0858)

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