CVE-2026-62183: Apache Syncope Privilege Escalation Flaw

CVE-2026-62183 Overview

CVE-2026-62183 is an improper privilege management vulnerability [CWE-269] in Apache Syncope, an open-source identity management system. The flaw allows an authenticated user to grant themselves defined Roles through a REST API call, effectively escalating their privileges to administrator. The issue manifests when the all-Java user workflow adapter is configured, or when the Flowable user workflow adapter is configured with a BPMN definition that does not require admin approval for self-registration or self-update requests. The vulnerability affects Apache Syncope versions 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.6, and 4.1.0-M0 through 4.1.1.

Critical Impact
A low-privileged user can obtain administrator-level Entitlements over the network without user interaction, compromising the confidentiality, integrity, and availability of the identity management platform.

Affected Products

Apache Syncope 3.0.0-M0 through 3.0.16
Apache Syncope 4.0.0-M0 through 4.0.6
Apache Syncope 4.1.0-M0 through 4.1.1

Discovery Timeline

2026-07-20 - CVE-2026-62183 published to NVD
2026-07-21 - Last updated in NVD database

Technical Details for CVE-2026-62183

Vulnerability Analysis

Apache Syncope manages users, groups, and Roles that carry Entitlements. Entitlements determine which administrative actions a principal can perform. The vulnerability lets a user modify their own Role assignments through a REST API call, bypassing the intended separation between self-service updates and administrative approval workflows.

Once a user assigns themselves a privileged Role, the platform grants that Role's Entitlements immediately. The specific privileges gained depend on how Roles are defined in the target deployment, but they can include full administrator capabilities over the identity store.

Root Cause

The root cause is missing authorization enforcement in the user self-update workflow. When the all-Java user workflow adapter is configured, or when the Flowable adapter is configured with a BPMN definition that does not require admin approval for self-registration or self-update, Role assignment fields in user update requests are treated as user-controllable data. The workflow layer does not restrict which fields a self-service request can modify, allowing Role and Entitlement mutation without administrative review.

Attack Vector

The vulnerability is exploitable over the network by any authenticated user who can reach the Syncope REST API. An attacker submits a user self-update request that includes Role assignments in the payload. The workflow adapter processes the request without admin approval, commits the Role changes, and the requester inherits the associated Entitlements on the next authenticated call. No user interaction from an administrator is required. See the Apache Mailing List Discussion and the Openwall OSS Security Update for the vendor advisory details.

Detection Methods for CVE-2026-62183

Indicators of Compromise

REST API calls to Syncope user self-update or self-registration endpoints containing Role assignment fields originating from non-administrative accounts.
Audit log entries showing Role or Entitlement changes on user accounts without a corresponding administrative approval event.
Unexpected administrative actions performed by accounts that were previously standard users.

Detection Strategies

Review Syncope audit logs for user update events where the acting principal and the target user are the same and Role membership changed.
Correlate BPMN workflow execution records with Role assignment changes to confirm each privileged change traversed an admin approval step.
Baseline the set of accounts holding administrative Entitlements and alert on any additions.

Monitoring Recommendations

Forward Syncope application and audit logs to a centralized logging platform for continuous review.
Enable alerting on HTTP requests to /users/self and related self-service endpoints that include Role or membership payload fields.
Monitor authentication events for accounts that begin invoking administrative REST endpoints after a Role change.

How to Mitigate CVE-2026-62183

Immediate Actions Required

Upgrade Apache Syncope to version 4.0.7 or 4.1.2, which remediate the vulnerability.
Inventory all Syncope deployments and identify instances running affected 3.0.x, 4.0.x, or 4.1.x releases.
Audit existing user accounts for unauthorized Role assignments granted before the patch is applied.

Patch Information

Apache has released fixed versions 4.0.7 and 4.1.2. Users on the 3.0.x branch should plan migration to a supported fixed release, as versions through 3.0.16 are affected. Refer to the Apache Mailing List Discussion for the official patch announcement.

Workarounds

If immediate upgrade is not possible, replace the all-Java user workflow adapter with a Flowable adapter whose BPMN definition requires admin approval for self-registration and self-update requests.
Review existing BPMN workflow definitions and add an administrative approval task before any Role or membership mutation.
Restrict network access to the Syncope REST API so only trusted management networks can reach self-service endpoints.

bash

# Verify installed Apache Syncope version and plan upgrade
curl -s https://syncope.example.com/syncope/rest/syncope | grep version

# Upgrade to a fixed release (example for 4.1 branch)
# Replace the deployed WAR with the 4.1.2 build and restart the container
mv syncope-4.1.2.war $CATALINA_HOME/webapps/syncope.war
systemctl restart tomcat