CVE-2026-3405

Low

Published: 02 March 2026

Published

02 March 2026

Modified

03 March 2026

KEV Added

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Patch

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CVSS Score 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Score 0.0018 38.7th percentile

Risk Priority 6 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-3405 is a low-severity Path Traversal (CWE-22) vulnerability in Jeesite Jeesite. Its CVSS base score is 3.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 38.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Directly prevents path traversal exploitation by validating and sanitizing user-supplied inputs to the Connection Handler component.

SI-2 Flaw Remediation good match

preventdetect

Identifies, reports, and remediates the specific path traversal flaw in JeeSite versions up to 5.15.1, including applying patches or workarounds.

AC-3 Access Enforcement partial match

prevent

Enforces access control policies to restrict unauthorized file reads even if path traversal inputs bypass initial checks.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1005 Data from Local System Collection

Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.

attack.mitre.org →

Why these techniques?

Path traversal vulnerability in public-facing web application (JeeSite) enables exploitation of public-facing application (T1190) and facilitates reading restricted files from the local system (T1005).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

A vulnerability has been found in thinkgem JeeSite up to 5.15.1. The affected element is an unknown function of the component Connection Handler. The manipulation leads to path traversal. It is possible to initiate the attack remotely. The attack is…

considered to have high complexity. The exploitability is described as difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Deeper analysisAI

CVE-2026-3405 is a path traversal vulnerability (CWE-22) affecting thinkgem JeeSite versions up to 5.15.1. The issue resides in an unknown function within the Connection Handler component, where manipulation enables traversal beyond intended directories. Published on 2026-03-02, it carries a low CVSS v3.1 base score of 3.1 (AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).

A remote attacker with low privileges can exploit this vulnerability over the network, though it demands high attack complexity, rendering exploitability difficult. Successful exploitation yields limited confidentiality impact, such as reading restricted files, with no effects on integrity or availability.

VulDB advisories note that the vendor was contacted early about the disclosure but provided no response. A proof-of-concept exploit has been publicly disclosed and may be usable, with references including VulDB entries and a Yuque document for further details. No patches or mitigations are specified.