CVE-2026-42797
Apache Syncope: JexlContextBuilder Information Disclosure
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.
INFO
Published Date :
May 25, 2026, 4:16 p.m.
Last Modified :
May 28, 2026, 8:19 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade to Apache Syncope version 4.0.6 or 4.1.1.
- Restrict JEXL expression definitions for administrators.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42797.
| URL | Resource |
|---|---|
| https://lists.apache.org/thread/5y7d277sntyytrmxnx2tfjr9ftcpq1s6 | Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/05/25/5 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42797 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42797
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42797 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42797 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 28, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (including) 3.0.16 *cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (excluding) 4.0.6 *cpe:2.3:a:apache:syncope:4.1.0:*:*:*:*:*:*:* Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/05/25/5 Types: Mailing List, Third Party Advisory Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/5y7d277sntyytrmxnx2tfjr9ftcpq1s6 Types: Mailing List, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 26, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
May. 25, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/05/25/5 -
New CVE Received by [email protected]
May. 25, 2026
Action Type Old Value New Value Added 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. Added CWE CWE-202 Added Reference https://lists.apache.org/thread/5y7d277sntyytrmxnx2tfjr9ftcpq1s6