How severe is CVE-2026-3404?

CVE-2026-3404 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-3404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3404?

CVE-2026-3404 affects Jeesite. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3404?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3404 have an EU (EUVD) identifier?

Yes. CVE-2026-3404 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9137.

When was CVE-2026-3404 published?

CVE-2026-3404 was published on 2026-03-02 and last updated on 2026-06-17.

CVE-2026-3404

CVE-2026-3404 is a medium-severity vulnerability in Jeesite with a CVSS 3.x base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-611.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
CVSS v2: 4.6
CVSS v4: 1.3
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9137
Weakness: CWE-611
Affected product: Jeesite
Published: 2026-03-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-3404?: 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.
How severe is CVE-2026-3404?: CVE-2026-3404 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-3404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3404?: CVE-2026-3404 affects Jeesite. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3404?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3404 have an EU (EUVD) identifier?: Yes. CVE-2026-3404 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9137.
When was CVE-2026-3404 published?: CVE-2026-3404 was published on 2026-03-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jeesite:jeesite:*:*:*:*:*:*:*:*

More vulnerabilities in Jeesite

CVE-2023-34601 — Critical (CVSS 9.8): Jeesite before commit 10742d3 was discovered to contain a SQL injection vulnerability via the component…
CVE-2020-19229 — Critical (CVSS 9.8): Jeesite 1.2.7 uses the apache shiro version 1.2.3 affected by CVE-2016-4437. Because of this version of the java…
CVE-2019-1010201 — Medium (CVSS 6.5): Jeesite 1.2.7 is affected by: SQL Injection. The impact is: sensitive information disclosure. The component is:…
CVE-2019-1010202 — Medium (CVSS 6.5): Jeesite 1.2.7 is affected by: XML External Entity (XXE). The impact is: sensitive information disclosure. The component…
CVE-2025-7864 — Medium (CVSS 6.3): A vulnerability was found in thinkgem JeeSite up to 5.12.0. It has been classified as critical. This affects the…
CVE-2025-7759 — Medium (CVSS 6.3): A vulnerability was identified in thinkgem JeeSite up to 5.12.0. This vulnerability affects unknown code of the file…

All CVEs affecting Jeesite →

Other CWE-611 (Improper Restriction of XML External Entity Reference (XXE)) vulnerabilities

CVE-2022-22486 — Critical (CVSS 10.0): IBM Tivoli Workload Scheduler 9.4, 9.5, and 10.1 is vulnerable to an XML External Entity Injection (XXE) attack when…
CVE-2019-14678 — Critical (CVSS 10.0): SAS XML Mapper 9.45 has an XML External Entity (XXE) vulnerability that can be leveraged by malicious attackers in…
CVE-2015-9280 — Critical (CVSS 10.0): MailEnable before 8.60 allows XXE via an XML document in the request.aspx Options parameter.
CVE-2018-1000838 — Critical (CVSS 10.0): autopsy version <= 4.9.0 contains a XML External Entity (XXE) vulnerability in CaseMetadata XML Parser that can result…
CVE-2018-1000837 — Critical (CVSS 10.0): UML Designer version <= 8.0.0 contains a XML External Entity (XXE) vulnerability in XML parser for plugins that can…
CVE-2018-1000835 — Critical (CVSS 10.0): KeePassDX version <= 2.5.0.0beta17 contains a XML External Entity (XXE) vulnerability in kdbx file parser that can…

Browse all CWE-611 (Improper Restriction of XML External Entity Reference (XXE)) vulnerabilities →