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CVE-2026-23794: Apache Syncope: Reflected XSS on Enduser Login

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-03 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• Apache Software Foundation Apache Syncope: from 3.0.0 before 3.0.16; from 4.0.0 before 4.0.4 — fixed in 3.0.16, 4.0.4

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Syncope 3.0.16, 4.0.4. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/7h30ghqdsf3spl3h7gdmscxofrm8ygjo
• http://www.openwall.com/lists/oss-security/2026/02/02/1

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