CVE-2026-62183: Apache Syncope: User self-service privilege escalation

[Francesco Chicchiriccò <ilgrosso () apache org>]

Severity: important 

Affected versions:

- Apache Syncope (org.apache.syncope.core:syncope-core-workflow-java) 3.0.0-M0 through 3.0.16
- Apache Syncope (org.apache.syncope.core:syncope-core-workflow-java) 4.0.0-M0 through 4.0.6
- Apache Syncope (org.apache.syncope.core:syncope-core-workflow-java) 4.1.0-M0 through 4.1.1

Description:

Improper Privilege Management vulnerability in Apache Syncope.

When:

* the all-Java user workflow adapter is configured, or
* the Flowable user workflow adapter is configured, bearing a BPMN definition not requiring admin approval for user 
self registration of self update requests

the following scenario could happen.
A REST API call can allow the user to grant themselves one or more of defined Roles, thus gaining their Entitlements 
and becoming in fact an administrator; the actual Entitlements gained depend on the Roles that are effectively defined 
on the specific Syncope deployment.


This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.6, from 4.1.0-M0 through 
4.1.1.

Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue.

Credit:

Nic Jones (finder)
elin kai (finder)

References:

https://syncope.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-62183