Raw 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:XSummary
CVE-2026-3404 is a low-severity Externally Controlled Reference to a Resource in Another Sphere (CWE-610) vulnerability in Jeesite Jeesite. Its CVSS base score is 2.3 (Low).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 28th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and AC-4 (Information Flow Enforcement) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-3404 is a vulnerability in thinkgem JeeSite versions up to 5.15.1, affecting an unknown function in the file /com/jeesite/common/shiro/cas/CasOutHandler.java of the Endpoint component. The flaw enables XML external entity (XXE) reference attacks, corresponding to CWEs CWE-610 and CWE-611. Published on 2026-03-02, it carries a CVSS v3.1 base score of 5.0 (AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L).
A remote attacker with low privileges (PR:L) can exploit this issue via a highly complex manipulation requiring high attack complexity (AC:H). Successful exploitation leads to low impacts on confidentiality, integrity, and availability, such as limited data disclosure, modification, or denial of service. Exploitability is considered difficult.
Advisories from VulDB indicate that an exploit has been published and may be used, with references including https://vuldb.com/?ctiid.348299, https://vuldb.com/?id.348299, https://vuldb.com/?submit.763732, and https://www.yuque.com/la12138/pa2fpb/ew8x2qss8dv0bsu0?singleDoc. The vendor was contacted early about the disclosure but did not respond in any way, and no patches or mitigations are mentioned.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9137
Vulnerability Data
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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- 3 hardening rules · 2 OS baselines
V1.5.1V15.3.2
Mitigating Controls (NIST 800-53 r5) AI
Enforces access authorizations so externally supplied references cannot reach resources outside the intended sphere.
Controls information flow between security domains, blocking resolution of external references to unintended spheres.
Secure configuration settings can disable external entity processing in XML parsers.
Developer testing can discover XXE flaws through targeted XML parsing tests.
Validates information inputs, directly stopping externally controlled names or references from being accepted.
Monitors and controls boundary communications, limiting the ability of external references to reach protected resources.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Hardened XML parser configurations directly disable external entity resolution.
Secure development practices directly require input validation and reference sanitization that prevent externally-controlled resource references.
Runtime monitoring of software and data flows can detect anomalous external resource accesses that result from this weakness.
Vulnerability scanning can discover XXE flaws but does not prevent their introduction in code.
Network segmentation and access controls limit the blast radius when an external reference escapes its intended sphere.
Patching eliminates XXE-vulnerable parser versions but is only one aspect of software maintenance.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can detect instances of the weakness but does not prevent it at design or coding time.
Vulnerability management identifies and patches XML libraries with unsafe default entity settings.
Secure development lifecycle mandates validation of all external references to prevent uncontrolled resource access.
Application security requirements explicitly call for controls against externally supplied resource identifiers.
Secure architecture principles reduce the attack surface for externally controlled references but do not prescribe specific validation rules.
Secure coding standards require input validation and canonicalization to block externally controlled resource references.
Hardening callouts derived
Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).
Oracle Linux 8 (1 rule)
- V-248577 OL 8 must enable kernel parameters to enforce Discretionary Access Control (DAC) on symlinks. prevents CWE-610