CVE-2026-3404: A flaw has been found in thinkgem JeeSite up to 5.15.1

Q: How do I fix CVE-2026-3404?

jeesite: upgrade to newer than 5.15.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-3404 being exploited?

CVE-2026-3404 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-3404 affect?

CVE-2026-3404 affects jeesite. Severity is medium (CVSS 5.0). 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 referen

Q: How urgent is CVE-2026-3404?

Priority 31/100. Public exploit reference

Routine

MEDIUM 5.0UPGRADE

CVE-2026-3404 is a medium-severity flaw (CVSS 5.0) affecting jeesite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-610, CWE-611
Published	2026-03-02
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: jeesite

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-02 02:16 UTCPublished CVE record published
2026-06-17 10:43 UTCUpdated Record last modified

jeesite jeesite UPGRADE

Affected: <= 5.15.1

Fixed in: newer than 5.15.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jeesite || rpm -q jeesite || jeesite --version

2. UPGRADE to newer than 5.15.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jeesite

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jeesite

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-3404?

jeesite: upgrade to newer than 5.15.1. Exact commands for each OS are on this page.

Is CVE-2026-3404 being exploited?

CVE-2026-3404 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-3404 affect?

CVE-2026-3404 affects jeesite. Severity is medium (CVSS 5.0). 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 referen

How urgent is CVE-2026-3404?

Priority 31/100. Public exploit reference

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-3405 LOW 3.1 UPGRADE A vulnerability has been found in thinkgem JeeSite up to 5.15.1
CVE-2025-9796 LOW 3.5 UPGRADE A vulnerability was found in thinkgem JeeSite up to 5.12.1
CVE-2025-7865 LOW 3.5 UPGRADE A vulnerability was found in thinkgem JeeSite up to 5.12.0
CVE-2025-7864 MEDIUM 6.3 UPGRADE A vulnerability was found in thinkgem JeeSite up to 5.12.0
CVE-2025-7863 LOW 3.5 UPGRADE A vulnerability was found in thinkgem JeeSite up to 5.12.0 and classified as problematic

References

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