CVE-2026-3405
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA path traversal vulnerability exists in the Connection Handler component of thinkgem JeeSite up to version 5.15.1. The vulnerability allows remote attackers to access files outside the web root directory through manipulation of input parameters used in file path operations.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 5.15.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify JeeSite versionLocate the version file, pom.xml, or check the administration interface to determine the installed JeeSite version numberAffected if The installed version is 5.15.1 or any earlier version (anything <= 5.15.1)
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Locate Connection Handler componentSearch the application codebase or configuration files for classes or modules named ConnectionHandler or similar that handle file-based connectionsAffected if The Connection Handler component is present and actively used in the deployment
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Verify web-accessible file path endpointsIdentify any web endpoints or APIs that accept file path parameters and are exposed externallyAffected if Endpoints accepting file path input are reachable without authentication or with low-privileged access
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Test for path traversal protectionSend requests with '../' sequences in path parameters to identified endpoints and observe if directory traversal is blocked or allowedAffected if The application returns files or content from directories outside the intended web root
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Review input validation configurationExamine configuration files or code for validation rules applied to file path parameters in the Connection HandlerAffected if No input validation or allowlist filtering is configured for path parameters
A user is affected if they are running JeeSite version 5.15.1 or earlier AND the Connection Handler component with file path parameters is exposed through accessible web endpoints.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement strict input validation and sanitization for all file path parameters, use secure file access methods that restrict traversal sequences (../), and consider upgrading to a patched version if available since the vendor has not responded to the disclosure.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-3405 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-3405 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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