Apache Syncope remote code execution via Flowable JUEL expression (CVE-2026-109083)
Administrators can import arbitrary BPMN process definitions containing JUEL expressions via REST API.
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CVE-2026-109083
RCE via JUEL in Apache Syncope BPMN import
- CVSS 3.1
- 9.8 critical
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
Apache Syncope administrators can import BPMN process definitions containing JUEL expressions via REST API and start them, executing expressions directly on the server without sandboxing. This RCE affects versions 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.8, and 4.1.0 through 4.1.3. Upgrade to 4.0.9 or 4.1.4 fixes it.
What to do: Upgrade to 4.0.9 or 4.1.4.
| Product | Affected | Fixed in |
|---|---|---|
| Apache Syncope | 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.8, 4.1.0 through 4.1.3 | 4.0.9, 4.1.4 |
Estimated exposure
nicheNo basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
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.
- Weakness
- CWE-653
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H