Critical severity · published Jul 20, 2026
CVE-2026-53405
Apache Syncope: Remote Code Execution via Flowable BPMN Groovy ScriptTask
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
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 containing a Groovy scriptTask is imported and started, the Groovy script is executed directly on the server, with no sandbox.
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 wrapping Flowable's Groovy scriptTasks with security sandbox.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Apache Syncope · Apache Software Foundation
3.0.0-M0 through 3.0.16; 4.0.0-M0 through 4.0.6; 4.1.0-M0 through 4.1.1 · source: vendor
SY
Syncope · Apache
3.0.0 through 3.0.16; 4.0.0 before 4.0.7; 4.1.0 before 4.1.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53405
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53405
Mailing List
https://lists.apache.org/thread/vdq0tk6ylffz6trbgbllj9kb1ndzff7k
Mailing List
http://www.openwall.com/lists/oss-security/2026/07/20/6
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