Vulnerability in Apache Syncope
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.001
Affected products
- Apache Syncope — versions 4.1.0
- Apache Software Foundation Syncope — versions 3.0, 4.0, 4.1
Weakness classification (CWE)
References
- lists.apache.org/thread/5y7d277sntyytrmxnx2tfjr9ftcpq1s6 (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-42797?
- CVE-2026-42797 is a medium-severity vulnerability in Apache Syncope, classified under CWE-202. CVSS score: 4.9/10. Published 2026-05-25.
- How severe is CVE-2026-42797?
- Medium severity. CVSS v3 base score is 4.9 out of 10.