CVE-2026-73191: Apache Software Foundation Apache Syncope

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Apache Syncope. When the Syncope SRA is configured for CAS authentication, the target Apereo CAS instance's URL is calculated by unconditionally looking at client-supplied forwarded HTTP headers. This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.7, from 4.1.0-M0 through 4.1.2. Users are recommended to upgrade to version 4.0.8 / 4.1.3, which fix this issue.

Affected products

• Apache Software Foundation Apache Syncope: from 3.0.0-M0, up to and including 3.0.16; from 4.0.0-M0, up to and including 4.0.7; from 4.1.0-M0, up to and including 4.1.2

Published 2026-09-14. Last modified 2026-09-14.