CVE-2021-42123
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 · uneditedUnrestricted File Upload in Web Applications operating on Business-DNA Solutions GmbH’s TopEase® Platform Version <= 7.1.27 in the File Upload Functions allows an authenticated remote attacker with Upload privileges to upload files with any file type, enabling client-side attacks.
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 · high confidenceUnrestricted file upload vulnerability in TopEase® Platform version 7.1.27 and below allows authenticated users with upload privileges to upload files of any type without proper validation, enabling client-side attacks such as XSS or phishing.
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<= 7.1.27CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 TopEase platform installationLocate the TopEase web application by checking for TopEase-specific paths, branding, or admin interfaces in your web server directories or running services.Affected if TopEase Platform is present in the environment
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Determine installed versionAccess the admin panel, check version information in system settings, or inspect version files in the TopEase installation directory. Compare the version number to the affected range <= 7.1.27.Affected if The installed version is 7.1.27 or lower
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Verify file upload functionality is accessibleLog in as an authenticated user with standard privileges and navigate to the file upload feature, or inspect the application's permission configuration to determine if upload privileges are granted to any user role.Affected if File upload functionality is enabled and accessible to authenticated users
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Check uploaded file storage locationInspect the application configuration or locate the upload directory to determine if uploaded files are stored within the web root (publicly accessible) or outside of it.Affected if Uploaded files are stored inside the web-accessible directory
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Verify file type validation is implementedAttempt to upload a non-standard file type (such as .html, .js, or .svg) through the upload feature, or examine the application's upload handler code/configuration for extension, MIME type, or magic byte validation rules.Affected if No file type validation is enforced, or validation can be bypassed allowing dangerous file types
The environment is affected if TopEase Platform version 7.1.27 or lower is installed, file upload is enabled for authenticated users, and no proper file type validation or safe storage configuration is in place.
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 dataUpgrade to a version newer than 7.1.27 and implement strict file type validation (extension, MIME type, magic bytes) with files stored outside the web root or served with proper Content-Disposition headers.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-42123 — 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-2021-42123 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data