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Message-ID: <0955bb5d-cc14-6741-de89-d2456661fccb@apache.org>
Date: Mon, 02 Nov 2026 12:40:01 +0000
From: Francesco Chicchiriccò <ilgrosso@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-109083: Apache Syncope: Remote Code Execution via
Flowable JUEL expression
Severity: moderate
Affected versions:
- Apache Syncope 3.0.0-M0 through 3.0.16
- Apache Syncope 4.0.0-M0 through 4.0.8
- Apache Syncope 4.1.0 through 4.1.3
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.
Credit:
Josh Bressers (coordinator)
Yll Berisha (finder)
References:
https://syncope.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-109083
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