Which versions of Java are affected by CVE-2026-3404?

Organizations using thinkgem JeeSite should be aware of moderate risk from CVE-2026-3404 rated CVSS 5.0. Exploitation could compromise the security of affected deployments.

Is there a public PoC exploit available for CVE-2026-3404?

Yes, a public proof-of-concept exploit is available for CVE-2026-3404. Prioritise patching immediately. EPSS: 0.0%.

Java CVE-2026-3404

Q: What is the CVSS score of CVE-2026-3404?

CVE-2026-3404 has a CVSS 4.0 base score of 1.3 (Low). CVSS vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

LOW

Externally Controlled Reference to a Resource in Another Sphere (CWE-610)

2026-03-02 cna@vuldb.com

Java XXE

1.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

1.3 LOW

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

5.0 (MEDIUM) 1.3 (LOW)

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Mar 09, 2026 - 16:52 vuln.today

Public exploit code

CVE Published

Mar 02, 2026 - 02:16 nvd

MEDIUM 5.0

DescriptionCVE.org

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.

AnalysisAI

Jeesite versions up to 5.15.1. contains a vulnerability that allows attackers to xml external entity reference (CVSS 5.0).

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.0 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this vulnerability to xml external entity reference.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running thinkgem JeeSite and apply vendor patches as part of regular patch cycle. …

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CVE-2026-3404 vulnerability details – vuln.today

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