plantuml — Vulnerabilities & Security Advisories 4

Plantuml is a Java-based tool for creating UML diagrams through text descriptions, widely used in software development for visualizing system architectures. Historically, it has been vulnerable to remote code execution (RCE) due to unsafe deserialization and improper input validation, as well as cross-site scripting (XSS) through crafted diagram inputs. The tool has faced privilege escalation risks in certain deployment scenarios. While no major public security incidents have been widely documented, the four CVEs on record highlight persistent concerns around input handling and sandbox bypasses. Its Java foundation introduces additional attack surfaces, though regular updates mitigate some risks. Users should implement strict input validation and maintain current versions to address potential vulnerabilities.