Medium severity · published Jan 16, 2026
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 interactive attributes in GraphViz…
6.1
CVSS
0.3%
EPSS
No
On KEV
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
net.sourceforge.plantuml:plantuml ·
before 1.2026.0 · source: vendor
PL
Plantuml · Plantuml
before 1.2026.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0858
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0858
Patch
https://github.com/plantuml/plantuml/commit/6826315db092d2e432aeab1a0894e08017c6e4bd
Release Notes
https://github.com/plantuml/plantuml/releases/tag/v1.2026.0
Patch
https://security.snyk.io/vuln/SNYK-JAVA-NETSOURCEFORGEPLANTUML-14552230