CVE-2026-9421
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 was determined in KLiK SocialMediaWebsite 1.0. This vulnerability affects the function uniqid of the file upload.inc.php of the component File Handler. This manipulation causes unrestricted upload. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized.
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 confidenceUnrestricted file upload vulnerability in the File Handler component (upload.inc.php) of KLiK SocialMediaWebsite 1.0. The uniqid() function is being used in a way that fails to properly validate or sanitize uploaded files, allowing attackers to upload malicious files by bypassing the intended file naming/validation logic.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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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Confirm KLiK SocialMediaWebsite installationSearch for the application files on the web server. Look for directories containing 'KLiK' or 'SocialMediaWebsite' and locate upload.inc.php within the codebase.Affected if The application KLiK SocialMediaWebsite 1.0 is present on the server
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Verify upload.inc.php exists and is web-accessibleCheck the web root for upload.inc.php. Common paths may include /include/, /inc/, or /components/ directories. Attempt to access it via HTTP if the application is live.Affected if upload.inc.php exists and is accessible via the web server
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Inspect the file naming mechanismExamine the source code of upload.inc.php and related File Handler components. Search for occurrences of 'uniqid(' function calls used for generating filenames.Affected if The code uses uniqid() for file naming in the upload functionality
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Check file validation logicReview the File Handler component code for file type/content validation. Look for magic byte checking, MIME type validation, or content analysis routines. Check if validation occurs before file save operations.Affected if Insufficient or missing server-side file validation (no magic byte checking, only extension-based validation)
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Determine upload directory locationLocate where uploaded files are stored. Check the upload configuration or code for the upload path. Verify if uploads are stored within the web root.Affected if Upload directory is within the web-accessible directory structure
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Verify upload functionality is enabledTest or review configuration to confirm the upload feature is active. Check if there are any disabled or commented-out upload-related settings in the application.Affected if The file upload functionality is enabled and operational
A user is affected if KLiK SocialMediaWebsite 1.0 is installed with upload.inc.php accessible and the code uses uniqid() for file naming with inadequate file validation.
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 comprehensive server-side file validation including MIME type checking, file extension allowlist, and file content analysis; store uploads outside the web root or rename files to prevent executable extensions from being served.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 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 $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-9421 — 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-2026-9421 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