CVE-2025-4561
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 · uneditedThe KFOX from KingFor has an Arbitrary File Upload vulnerability, allowing remote attackers with regular privilege to upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.
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 confidenceKFOX from KingFor contains an arbitrary file upload vulnerability. Attackers with regular user privileges can upload malicious files, including web shells, and execute them to achieve arbitrary code execution on the affected server.
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
- 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.
-
Identify if KFOX is deployedSearch for KFOX installation directories, running processes, or web application entries that indicate KingFor KFOX is in useAffected if KFOX from KingFor is present in the environment
-
Determine KFOX versionCheck the installed KFOX version by inspecting version files, about pages, or the application header/footer for version strings. Compare against any known affected version rangesAffected if The installed version falls within an affected range (if known) or is an unpatched version
-
Verify file upload feature is accessibleLocate the file upload functionality within KFOX - typically found in user profile sections, document management, or attachment features. Confirm the upload endpoint exists and respondsAffected if The file upload functionality is accessible to regular (non-privileged) authenticated users
-
Inspect file type validation configurationExamine the server-side file upload validation settings - check content-type headers, file extension allowlists, and magic byte validation in the application configuration or source codeAffected if File type validation is missing, weak, or can be bypassed (e.g., only checks file extension, no content-type validation)
-
Check upload directory webroot placementReview where uploaded files are stored relative to the webroot. Inspect the upload path configurationAffected if Uploaded files are stored within the webroot and script execution is not disabled in that directory
A user is affected if KFOX is running with file upload functionality accessible to regular authenticated users and proper server-side validation is not enforced.
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 file upload validation including file type whitelisting, content-type verification, and extension checking; store uploads outside the web root directory; disable script execution in upload directories; apply vendor security patches when available.
- Consultation3.0 h
- Implementation6.0 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 $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-4561 — 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-2025-4561 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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