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Apache Syncope Vulnerability Let Attackers Hijack User Sessions

A critical XML External Entity (XXE) vulnerability has been disclosed in the Apache Syncope identity management console. This flaw, tracked as CVE-2026-23795, affects multiple versions of the platform and requires immediate patching.

MBy Michael ReevesFeb 03, 20261 min read

A critical XML External Entity (XXE) vulnerability has been disclosed in the Apache Syncope identity management console. This flaw, tracked as CVE-2026-23795, affects multiple versions of the platform and requires immediate patching.

The vulnerability arises from the improper restriction of XML External Entity references in the Apache Syncope Console. It creates a pathway for XXE attacks when administrators create or edit Keymaster parameters. An attacker with sufficient administrative entitlements can craft malicious XML payloads to trigger unintended data exposure.

CVE ID Vulnerability CVSS Score Affected Component Affected Versions Attack Vector Impact

CVE-2026-23795 XML External Entity (XXE) Injection 6.5 Apache Syncope Console 3.0-3.0.15, 4.0-4.0.3 Network Data Exposure, Session Hijacking

Organizations running the affected versions should prioritize upgrading immediately. The vulnerability impacts Apache Syncope versions spanning two major release branches:

A critical XML External Entity (XXE) vulnerability has been disclosed in the Apache Syncope identity management console.
Michael Reeves · Thehackingpost

Component Affected Versions Fixed Version

Syncope Client IdRepo Console (3.x) 3.0 through 3.0.15 3.0.16

Syncope Client IdRepo Console (4.x) 4.0 through 4.0.3 4.0.4

The attack requires administrator-level access to exploit, limiting direct external attack surface but creating significant insider threat risks. XXE vulnerabilities operate at the application layer and can provide direct access to sensitive configuration data, user credentials, and authentication tokens. The implications extend beyond individual sessions to potentially compromise the entire authentication infrastructure.

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Apache recommends immediate upgrades to version 3.0.16 for users on the 3.x branch and version 4.0.4 for those on the 4.x branch. Organizations unable to patch immediately should restrict administrative console access to trusted personnel and implement additional network monitoring to detect suspicious XML parsing activity.

Organizations managing identity infrastructure should review their deployment status and prioritize this patch in their security update schedule to prevent potential session hijacking and data exposure incidents.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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