CVE-2026-42782: Apache Syncope

High severity, CVSS 7.2. EPSS: 0.9% chance of exploitation in the next 30 days.

Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate entitlements for Implementations can create a malicious Groovy class containing untrusted code reaching a non-sandboxed execution path via the class static initializer. This issue affects Apache Syncope: 3.0 through 3.0.16, 4.0 through 4.0.5, 4.1.0. Users are recommended to upgrade to version 4.0.6 / 4.1.1, which fix this issue by forcing even the static initializer in Groovy code to run in a sandbox.

Affected products

• Apache Syncope: from 3.0.0, up to and including 3.0.16; from 4.0.0, before 4.0.6 (fixed in 4.0.6); version 4.1.0 only

Published 2026-05-25. Last modified 2026-07-24.