What is CVE-2026-3404?

CVE-2026-3404 is a medium-severity vulnerability in Jeesite, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 5.0/10. Published 2026-03-02.

How severe is CVE-2026-3404?

Medium severity. CVSS v3 base score is 5.0 out of 10.

XXE in Jeesite

CVE-2026-3404

A flaw has been found in thinkgem JeeSite up to 5.15.1. Impacted is an unknown function of the file /com/jeesite/common/shiro/cas/CasOutHandler.java of the component Endpoint. Executing a manipulation can lead to xml external entity reference. The attack may be performed from remote. Attacks of this nature are highly complex. The exploitability is considered difficult. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

EPSS: 0.004 (27.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Jeesite
Thinkgem Jeesite — versions 5.15.0, 5.15.1

Weakness classification (CWE)

References

cna@vuldb.com (VDB Entry, Third Party Advisory, vdb-entry)
cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (Exploit, Third Party Advisory, exploit)

Frequently asked questions

What is CVE-2026-3404?: CVE-2026-3404 is a medium-severity vulnerability in Jeesite, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 5.0/10. Published 2026-03-02.
How severe is CVE-2026-3404?: Medium severity. CVSS v3 base score is 5.0 out of 10.