# CVE-2026-109083: Apache Syncope: Remote Code Execution via Flowable JUEL expression

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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 remediation reported in collected sources

## Affected products and versions

- Apache Software Foundation / Apache Syncope (org.apache.syncope.ext.flowable:syncope-ext-flowable-bpmn): ≥ 3.0.0-M0; ≤ 3.0.16 (affected, semver); ≥ 4.0.0-M0; ≤ 4.0.8 (affected, semver); ≥ 4.1.0; ≤ 4.1.3 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-653

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://lists.apache.org/thread.html/zmzxzxv7wjzn071jgn069y2rqjpcrt3s (CNA: apache; vendor-advisory)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-109083; retrieved 2026-11-02; source updated 2026-11-02

Revision: a4526d6002f54f0c0d6d004db064eb126b5c8273b93ad22fac9cd11d8133b607

Canonical: https://y2.dev/cve/CVE-2026-109083

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