What is CVE-2026-23794?

CVE-2026-23794 is a medium-severity vulnerability in Apache Syncope, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-02-03.

How severe is CVE-2026-23794?

Medium severity. CVSS v3 base score is 6.8 out of 10.

XSS in Apache Syncope

CVE-2026-23794

Reflected XSS in Apache Syncope's Enduser Login page. An attacker that tricks a legitimate user into clicking a malicious link and logging in to Syncope Enduser could steal that user's credentials. 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: XSS (Cross-Site Scripting)

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

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Apache Syncope
Apache Software Foundation Syncope — versions 3.0, 4.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

lists.apache.org/thread/7h30ghqdsf3spl3h7gdmscxofrm8ygjo (vendor-advisory, Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-23794?: CVE-2026-23794 is a medium-severity vulnerability in Apache Syncope, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-02-03.
How severe is CVE-2026-23794?: Medium severity. CVSS v3 base score is 6.8 out of 10.