CVE-2026-53405: Apache Syncope

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate entitlements can import arbitrary BPMN process definitions via the REST API and then start the process. When a BPMN process containing a Groovy scriptTask is imported and started, the Groovy script is executed directly on the server, with no sandbox. This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.6, from 4.1.0-M0 through 4.1.1. Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue by wrapping Flowable's Groovy scriptTasks with security sandbox.

Affected products

• Apache Syncope: from 3.0.0, up to and including 3.0.16; from 4.0.0, before 4.0.7 (fixed in 4.0.7); from 4.1.0, before 4.1.2 (fixed in 4.1.2)

Published 2026-07-20. Last modified 2026-07-27.