CVE-2026-0858 — Cross-site Scripting in Plantuml

CWE-79 — Cross-site Scripting7 documents6 sources
Severity
5.1MEDIUMNVD
EPSS
0.0%
top 96.76%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
PlantumlDebian Plantuml
Timeline
PublishedJan 16

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.

CVSS 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

Affected Packages2 packages

▶NVDplantuml/plantuml< 1.2026.0

Patches

Patch: github.com ↗Patch: security.snyk.io ↗

🔴Vulnerability Details

3
OSV
PlantUML is vulnerable to Stored XSS due to insufficient sanitization of interactive attributes in GraphViz diagrams↗2026-01-16
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GHSA
PlantUML is vulnerable to Stored XSS due to insufficient sanitization of interactive attributes in GraphViz diagrams↗2026-01-16
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OSV
CVE-2026-0858: Versions of the package net↗2026-01-16
▶

📋Vendor Advisories

2
Red Hat
plantuml: PlantUML: Arbitrary script execution via Stored Cross-Site Scripting in GraphViz diagrams↗2026-01-16
▶
Debian
CVE-2026-0858: plantuml - Versions of the package net.sourceforge.plantuml:plantuml before 1.2026.0 are vu...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-0858 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-0858 — Cross-site Scripting in Plantuml | cvebase