CVE-2026-109083

Apache Syncope: Remote Code Execution via Flowable JUEL expression

Published Nov 2, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
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 JUEL expression is imported and started, the expression 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 4.0.8, from 4.1.0 through 4.1.3.



Users are recommended to upgrade to version 4.0.9 / 4.1.4, which fix this issue by rejecting BPMN definitions including expression attributes.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
First Time appeared Apache
Apache syncope
Vendors & Products Apache
Apache syncope
Type Values Removed Values Added
Description 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 JUEL expression is imported and started, the expression 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 4.0.8, from 4.1.0 through 4.1.3. Users are recommended to upgrade to version 4.0.9 / 4.1.4, which fix this issue by rejecting BPMN definitions including expression attributes.
Title Apache Syncope: Remote Code Execution via Flowable JUEL expression
Weaknesses CWE-653
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Nov 6, 2026, 6:36 PM
Reserved
Oct 12, 2026, 6:15 AM
Status
Deferred
Published
Nov 2, 2026, 2:17 PM
Modified
Nov 6, 2026, 7:17 PM