CVE-2026-42797: Apache Syncope: JexlContextBuilder Information Disclosure

[Francesco Chicchiriccò <ilgrosso () apache org>]

Severity: moderate 

Affected versions:

- Apache Syncope (org.apache.syncope.core:syncope-core-provisioning-api) 3.0 through 3.0.16
- Apache Syncope (org.apache.syncope.core:syncope-core-provisioning-api) 4.0 through 4.0.5
- Apache Syncope (org.apache.syncope.core:syncope-core-provisioning-api) 4.1 through 4.1.0

Description:

Exposure of Sensitive Information Through Data Queries vulnerability in Apache Syncope.

An administrator with adequate entitlements for Derived Schemas can create a malicious JEXL expression which allows any 
administrator with sufficient entitlements for User read to access User-related security-sensitive information.

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 further restricting the JEXL 
expression definition.

Credit:

elin kai (finder)

References:

https://syncope.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-42797