CVE-2026-23794: Apache Syncope

Medium severity, CVSS 6.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Reflected XSS in Apache Syncope's Enduser Login page. An attacker that tricks a legitimate user into clicking a malicious link and logging in to Syncope Enduser could steal that user's credentials. 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.