What is CVE-2026-53405?

CVE-2026-53405 is a critical-severity vulnerability in Apache Software Foundation Syncope, classified under CWE-653. CVSS score: 9.8/10. Published 2026-07-20.

How severe is CVE-2026-53405?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Apache Software Foundation Syncope

CVE-2026-53405

Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate entitlements can import arbitrary BPMN process definitions via the REST API and then start the process. When a BPMN process contain…

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apache Software Foundation Syncope — versions 3.0.0-M0, 4.0.0-M0, 4.1.0-M0

Weakness classification (CWE)

CWE-653

References

security@apache.org (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-53405?: CVE-2026-53405 is a critical-severity vulnerability in Apache Software Foundation Syncope, classified under CWE-653. CVSS score: 9.8/10. Published 2026-07-20.
How severe is CVE-2026-53405?: Critical severity. CVSS v3 base score is 9.8 out of 10.