CVE-2026-3404 thinkgem JeeSite Endpoint CasOutHandler.java xml external entity reference

Low 2.3 Published 2 Mar 2026 Updated 2 Mar 2026

Remote attackers can exploit an XML External Entity vulnerability in JeeSite's CasOutHandler to read sensitive data or cause denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-3404?

CVE-2026-3404 is a low-severity vulnerability in thinkgem JeeSite, published on 2 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-611, CWE-610

Which versions are affected by CVE-2026-3404?

It affects 1 product.

Products include Jeesite Jeesite.

How do I fix CVE-2026-3404?

No fix has been published for CVE-2026-3404 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-3404 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3404 exists.

Sources

Also known as GHSA-7p6h-h74m-fpv3.