Improper isolation or compartmentalization in Apache Syncope - CVE-2026-53405
Published: August 24, 2026
Vulnerability identifier: #VU144733
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53405
CWE-ID: CWE-653
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper isolation or compartmentalization in Flowable BPMN Groovy scriptTask handling when importing and starting a crafted BPMN process definition via the REST API. A remote user can import a BPMN process definition containing a Groovy scriptTask and start the process to execute arbitrary code.
Exploitation requires administrative entitlements to import process definitions and start the process.
Affected software
Apache Syncope
How to mitigate CVE-2026-53405
Install security update from vendor's website.
Apache Syncope - addressed in versions 4.0.7, 4.1.2