CVE-2026-53421: Apache Syncope: Remote Code Execution via Scripted Connector

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-20 · updated 2026-10-24
Weakness: CWE-653

Description

Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate entitlements can achieve remote code execution through the connector subsystem by relying on scripted connectors' (REST and SQL) capability to run Groovy scripts. This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.6, from 4.1.0-M0 through 4.1.1. Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue by hardening the Groovy security sandbox.

Affected products

Apache Software Foundation Apache Syncope: from 3.0.0 through 3.0.16; from 4.0.0 before 4.0.7; from 4.1.0 before 4.1.2 — fixed in 4.0.7, 4.1.2

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Syncope 4.0.7, 4.1.2. Check the vendor advisory for mitigations.

References

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