Review reviewHigh

CVE-2026-42782

Apache Software Foundation Apache Syncope, syncope

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.

CVSS: 7.2
EPSS: 0.65%
CISA KEV: Not listed
Published: 2026.05.26

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.65%

Technical severityCVSS 7.2

Vulnerability overview

Affected product and versions

Product: Apache Software Foundation Apache Syncope, syncope
Affected versions: >= 3.0 <= 3.0.16, >= 4.0 <= 4.0.5, >= 4.1 <= 4.1.0, >= 3.0.0 <= 3.0.16, >= 4.0.0 < 4.0.6, 4.1.0
Fixed versions: 4.0.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Apache Software Foundation Apache Syncope, syncope and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-653