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Advisory record · GHSA-hrvf-g648-rf3m

PlantUML is vulnerable to Stored XSS due to insufficient sanitization of interactive attributes in GraphViz diagrams

CVSS 5.1 MediumEPSS 0.0034 · 27th percentile

Published by the GitHub Advisory Database at 16 Jan 2026, 06:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
net.sourceforge.plantuml:plantumlMaven<1.2026.01.2026.0
Identifiers
GHSA-hrvf-g648-rf3m · CVE-2026-0858
Weakness (CWE)
CWE-79
Tags
Published
16 Jan 2026
Updated
3 Feb 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

PlantUML (net.sourceforge.plantuml:plantuml) versions before 1.2026.0 are vulnerable to stored cross-site scripting through insufficient sanitization of interactive attributes in GraphViz diagrams. An attacker who supplies a crafted diagram can inject JavaScript into the generated SVG, which then runs in the context of any application that renders it. Upgrade to version 1.2026.0 or later.

Written 7 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.1 Medium 4.0 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 CNA (snyk)
  • CISA KEV Not listed.
  • EPSS 0.0034, the 27th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:09 UTC First seen by agentprime
  2. 31 Oct 2026, 15:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.