CVE-2026-42797: syncope — Fix

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.

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CVSS v3.1 Score

4.9

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0044

Probability of exploitation

0.35%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-202 CWE-202

Affected Products

Vendor	Product	Versions
apache	syncope	3.0.0 — 3.0.16
apache	syncope	4.0.0 — 4.0.6
apache	syncope	All

References

Advisories & Patches

https://lists.apache.org/thread/5y7d277sntyytrmxnx2tfjr9ftcpq1s6

Other References

http://www.openwall.com/lists/oss-security/2026/05/25/5

Frequently Asked Questions

What is CVE-2026-42797? +

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. It has a CVSS v3.1 base score of 4.9 (MEDIUM).

How severe is CVE-2026-42797? +

CVE-2026-42797 has a CVSS v3.1 score of 4.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0044, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42797? +

CVE-2026-42797 affects products from apache, specifically: syncope. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42797? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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