CVE-2026-0858 — MEDIUM (6.1)

Q: How severe is CVE-2026-0858?

CVE-2026-0858 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-0858?

Check the references section above for vendor advisories and patch information. Affected products include: Plantuml Plantuml.

Vulnerability 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 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Plantuml	Plantuml	< 1.2026.0

Related Weaknesses (CWE)

CWE-79

References

https://github.com/plantuml/plantuml/commit/6826315db092d2e432aeab1a0894e08017c6Patch
https://github.com/plantuml/plantuml/releases/tag/v1.2026.0Release Notes
https://security.snyk.io/vuln/SNYK-JAVA-NETSOURCEFORGEPLANTUML-14552230Vendor AdvisoryPatch

FAQ

What is CVE-2026-0858?

CVE-2026-0858 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 c...

How severe is CVE-2026-0858?

CVE-2026-0858 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-0858?

Check the references section above for vendor advisories and patch information. Affected products include: Plantuml Plantuml.