CVE-2026-23795: Apache Syncope

Medium severity, CVSS 4.9. EPSS: 1.9% chance of exploitation in the next 30 days.

Improper Restriction of XML External Entity Reference vulnerability in Apache Syncope Console. An administrator with adequate entitlements to create or edit Keymaster parameters via Console can construct malicious XML text to launch an XXE attack, thereby causing sensitive data leakage occurs. This issue affects Apache Syncope: from 3.0 through 3.0.15, from 4.0 through 4.0.3. Users are recommended to upgrade to version 3.0.16 / 4.0.4, which fix this issue.

Affected products

• Apache Syncope: from 3.0.0, before 3.0.16 (fixed in 3.0.16); from 4.0.0, before 4.0.4 (fixed in 4.0.4)

Published 2026-02-03. Last modified 2026-06-17.