A critical XML External Entity (XXE) vulnerability has been discovered in the Apache Syncope identity management console . The vulnerability could inadvertently lead administrators to expose sensitive user data and compromise session security.
See also: Apache bRPC: Vulnerability allows RCE attacks
The vulnerability, identified as CVE-2026-23795, affects multiple versions of the platform and requires immediate application of patch updates.
Insufficiently restrictive policy on XML External Entity references in Apache Syncope Console allows XXE attacks to be exploited when administrators create or edit Keymaster . An attacker with sufficient administrative privileges can craft malicious XML payloads, causing unauthorized data disclosure. This attack vector bypasses standard security mechanisms by exploiting the way the application processes XML inputs without adequate validation and sanitization.
XXE-type vulnerabilities are among the most dangerous attack vectors in identity management systems, as they operate at the application level and can offer direct access to sensitive configuration data, user credentials, and authentication tokens.
See also: Vulnerability in Apache StreamPipes could lead to complete control by hackers
Given Apache Syncope's role as an identity management and access control platform, the consequences are not limited to individual sessions, but may affect the entire authentication infrastructure.
The vulnerability affects versions of Apache Syncope covering two major traffic streams; organizations using these versions should prioritize upgrading immediately. Exploiting the vulnerability requires administrator privileges, which limits the external attack surface, but significantly increases the risks from insider threats.
Apache recommends upgrading immediately to version 3.0.16 for those using the 3.x branch and to version 4.0.4 for users of the 4.x branch.
Organizations that cannot immediately implement the fix should restrict access to the management console to trusted personnel only and enable additional network monitoring mechanisms to detect suspicious activity during XML parsing.
See also: Apache Tika: Risk from vulnerability that was fixed months ago
Organizations that manage identity infrastructures are urged to review the status of their installations and place this update at a high priority in their security update schedule, in order to prevent potential incidents of session hijacking and data leakage.
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