Apache Syncope: Remote Code Execution via Flowable JUEL expression

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-109083
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-02 14:17:35 UTC
Updated2026-11-06 19:17:06 UTC
DescriptionImproper 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.005190000 probability, percentile 0.443490000 (date 2026-11-08)

Problem Types: CWE-653 | CWE-653 CWE-653 Improper isolation or compartmentalization

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Syncope affected 3.0.0-M0 3.0.16 semver Not specified
CNA Apache Software Foundation Apache Syncope affected 4.0.0-M0 4.0.8 semver Not specified
CNA Apache Software Foundation Apache Syncope affected 4.1.0 4.1.3 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/11/02/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread.html/zmzxzxv7wjzn071jgn069y2rqjpcrt3s [email protected] lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Josh Bressers (en)

CNA: Yll Berisha (en)

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