External risk intelligence

Apache Syncope Authorization Bypass via Delegated Admin Realm Relocation

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-113511

Apache Syncope is an identity and access management platform. While identity services often have public-facing components, this specific vulnerability involves internal administrative actions regarding realm subtree relocation. While the application may be internet-accessible, this specific administrative function is typically restricted to authorized personnel rather than being exposed to the public internet.

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory details an authorization bypass vulnerability within Apache Syncope, an identity and access management platform. The issue allows a delegated administrator to move administrative sections without proper permission, potentially impacting internal access controls. The main concern is confirming relevance and exposure to our internal administrative operations.

Bypasses authorization for administrative actions.
Impacts internal control over administrative realms.
Confirm relevance and internal exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by bypassing authorization controls within Apache Syncope, specifically targeting the relocation of Realm subtrees. This could allow a delegated administrator to move these subtrees across administrative boundaries without the necessary permissions.

Requires delegated administrator access.
Triggers during realm subtree relocation.
Allows unauthorized administrative actions.

Live Threat

Current exploitation, exposure, and threat context

An authorization bypass vulnerability in Apache Syncope could allow a delegated administrator to relocate a Realm subtree across administrative realm boundaries without proper permission, when supported by the advisory.

Realm data could be affected.
Unauthorized relocation of Realm subtrees.
Data could be moved to unintended locations.

Operational Fix

Recommended remediation, mitigation, and detection steps

Teams responsible for identity and access management platforms, such as platform or application owners, should prioritize addressing this authorization bypass vulnerability in Apache Syncope. The first practical step is to identify all Syncope instances, confirm their exposure and criticality, and then determine the accountable owner to plan remediation.

Identify Syncope instances and owners.
Verify administrative realm configuration and reachability.
Plan upgrade or apply vendor-provided mitigation.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is Apache Syncope and how is it used?

Apache Syncope is an open-source identity and access management (IAM) platform. Organizations use it to centralize the management of digital identities, handle user provisioning, and enforce access controls across various applications and IT systems.

What does CWE-639 mean for CVE-2026-113511?

CWE-639 refers to an Authorization Bypass Through User-Controlled Key. In the context of this vulnerability, it means the software fails to properly verify if a user has permission to perform a specific action, allowing them to manipulate identifiers to gain unauthorized access to administrative functions.

How is this authorization bypass triggered?

The vulnerability is triggered when a user with delegated administrative privileges attempts to relocate a Realm subtree. It does not occur during standard user authentication or routine read-only operations; it specifically requires the action of moving administrative data structures across boundaries.

Is my Apache Syncope instance at risk?

According to Halo Surface Signal, risk depends on accessibility. While the platform may be internet-facing, this specific bug involves administrative tasks typically restricted to internal personnel. If your administrative interface is reachable from the public internet, the potential for unauthorized internal control changes increases.

What should I do to secure my environment?

Begin by identifying all running Apache Syncope instances and their assigned owners. Confirm whether your administrative consoles are exposed to unauthorized networks, then coordinate with your team to plan an upgrade to version 4.0.9 or 4.1.4, which contain the necessary fixes for this authorization issue.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.