CVE-2026-3404Public exploitNetwork attack vector

Authenticated resource access via external XML entities

Published Mar 2, 2026 · Updated Mar 2, 2026

XML external entity processing in ThinkGem JeeSite 5.15.0 through 5.15.1 allows remote authenticated users to access referenced resources. CasOutHandler.java processes attacker-controlled XML without preventing external entity resolution, so the server follows references outside the intended data sphere. Low-privileged access and a high-complexity request are required; exploitation can disclose referenced data and initiate server-side requests.

CVSS severity8.1
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XML external entity processing in ThinkGem JeeSite 5.15.0 through 5.15.1 allows remote authenticated users to access referenced resources. CasOutHandler.java processes attacker-controlled XML without preventing external entity resolution, so the server follows references outside the intended data sphere. Low-privileged access and a high-complexity request are required; exploitation can disclose referenced data and initiate server-side requests.

The record

CVE
CVE-2026-3404
Published
Mar 2, 2026
Updated
Mar 2, 2026
Vendor
ThinkGem
Product
JeeSite
Classifications
CWE-610, CWE-611, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.15.0
  2. Affected versionversion=5.15.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ThinkGem · JeeSiteversion=5.15.0; version=5.15.1

Published CVSS scores

5.0VulDB CNACVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.6VulDB CNAAV:N/AC:H/Au:S/C:P/I:P/A:P
1.3VulDB CNACVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-610Externally Controlled Reference to a Resource in Another Sphere
CWE-611Improper Restriction of XML External Entity Reference
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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