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

Quick assessment

Affected
thinkgem JeeSite
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JeeSite是济南卓源（thinkgem）开源的一个Java快速开发平台。 JeeSite 5.15.1及之前版本存在代码问题漏洞，该漏洞源于对文件/com/jeesite/common/shiro/cas/CasOutHandler.java中组件的操作，可能导致XML外部实体引用攻击。

CVSS 5.0 · Medium EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-3404

Vulnerability Information
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Vulnerability Title
thinkgem JeeSite Endpoint CasOutHandler.java xml external entity reference
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5
Vulnerability Title
JeeSite 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JeeSite是济南卓源（thinkgem）开源的一个Java快速开发平台。 JeeSite 5.15.1及之前版本存在代码问题漏洞，该漏洞源于对文件/com/jeesite/common/shiro/cas/CasOutHandler.java中组件的操作，可能导致XML外部实体引用攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
thinkgem JeeSite 5.15.0 cpe:2.3:a:jeesite:jeesite:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-3404

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III. Intelligence Information for CVE-2026-3404

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News Coverage for CVE-2026-3404 (1)

IV. Related Vulnerabilities

Same product: JeeSite
Same vendor: thinkgem
Same weakness: CWE-611

V. Comments for CVE-2026-3404

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