CVE-2021-40337
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 · uneditedCross-site Scripting (XSS) vulnerability in Hitachi Energy LinkOne allows an attacker that manages to exploit the vulnerability can take advantage to exploit multiple web attacks and stole sensitive information. This issue affects: Hitachi Energy LinkOne 3.20; 3.22; 3.23; 3.24; 3.25; 3.26.
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 stored Cross-site Scripting (XSS) vulnerability in Hitachi Energy LinkOne's web interface allows authenticated attackers to inject malicious JavaScript code that executes in the browsers of other users. This can lead to session hijacking, credential theft, and unauthorized actions performed in the context of legitimate users.
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= 3.20= 3.22= 3.23= 3.24= 3.25= 3.26CVSS 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
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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 the installed LinkOne versionAccess the LinkOne administrative interface or check system configuration files for the product version number. Look for version information in the about page, system info, or installation documentation.Affected if The installed version is 3.20, 3.22, 3.23, 3.24, 3.25, or 3.26
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Confirm the web interface is accessibleVerify that the LinkOne web interface is reachable via HTTP/HTTPS on the expected port or URL path.Affected if The web interface is exposed and reachable
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Verify authentication is enabledCheck that user authentication is configured and active for the LinkOne web application. Confirm that login functionality is operational.Affected if Authentication is enabled and functional, as the vulnerability requires an authenticated attacker
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Inspect user input fields for unsanitized contentAs an authenticated user, examine web forms, user profile fields, or other input points where data is stored and displayed to other users. Submit test input with special characters and check if they are rendered without encoding.Affected if User-supplied content in web forms is stored and displayed to other users without proper sanitization or encoding
If the installed LinkOne version is 3.20, 3.22, 3.23, 3.24, 3.25, or 3.26 and the web interface with authentication is accessible, the environment is affected by this stored XSS vulnerability.
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 dataApply vendor-provided security patches for the affected versions (3.20, 3.22-3.26) or upgrade to a patched release. Implement input validation and output encoding as compensating controls until the patch can be deployed.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-40337 — 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-2021-40337 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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