# CVE-2026-53421

## Summary

- **CVE ID:** CVE-2026-53421
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-653
- **Published:** Jul 20, 2026
- **Last Modified:** Jul 21, 2026

## 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 (3.0.0-M0)
- Apache Software Foundation — Apache Syncope (4.0.0-M0)
- Apache Software Foundation — Apache Syncope (4.1.0-M0)

## References

- [CNA](https://lists.apache.org/thread/nmzvz6gb2ldm30wvyk613r8dfrb6r8yx)
- [CVE](http://www.openwall.com/lists/oss-security/2026/07/20/7)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.68%
- **EPSS Percentile:** 50.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._