What is CVE-2026-23795?

CVE-2026-23795 is a medium-severity vulnerability in Apache Syncope, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 4.9/10. Published 2026-02-03.

How severe is CVE-2026-23795?

Medium severity. CVSS v3 base score is 4.9 out of 10.

XXE in Apache Syncope

CVE-2026-23795

Improper Restriction of XML External Entity Reference vulnerability in Apache Syncope Console. An administrator with adequate entitlements to create or edit Keymaster parameters via Console can construct malicious XML text to launch an XXE attack, thereby causing sensitive data leakage occurs. This issue affects Apache Syncope: from 3.0 through 3.0.15, from 4.0 through 4.0.3. Users are recommended to upgrade to version 3.0.16 / 4.0.4, which fix this issue.

Vulnerability class: XXE (XML External Entity)

Published 2026-02-03 · last modified 2026-06-17.

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: 0.020 (79.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.020 · change: +0.001

Affected products

Apache Syncope
Apache Software Foundation Syncope — versions 3.0, 4.0

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

lists.apache.org/thread/mzgbdn8hzk8vr94o660njcc7w62c2pos (vendor-advisory, Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-23795?: CVE-2026-23795 is a medium-severity vulnerability in Apache Syncope, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 4.9/10. Published 2026-02-03.
How severe is CVE-2026-23795?: Medium severity. CVSS v3 base score is 4.9 out of 10.