CVE-2025-4258
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, which was classified as critical, was found in zhangyanbo2007 youkefu up to 4.2.0. Affected is the function Upload of the file \youkefu-master\src\main\java\com\ukefu\webim\web\handler\resource\MediaController.java. The manipulation of the argument imgFile leads to unrestricted upload. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
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 the MediaController.java Upload function of youkefu up to v4.2.0. The imgFile parameter is not properly validated, allowing remote attackers to upload arbitrary files (including malicious executables) by manipulating the upload request.
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>= 4.0, <= 4.2.0CVSS 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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Confirm youkefu installation and versionLocate the youkefu application installation directory and identify the version. Check version files such as version.properties, pom.xml, or the application metadata in the WAR deployment. Youkefu is a Java web application typically deployed as a WAR file.Affected if The installed version is >= 4.0 and <= 4.2.0
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Locate MediaController.java and verify upload function existsFind the MediaController.java file in the deployed application source or decompile the WAR file. Verify that the Upload function handling the imgFile parameter is present in the codebase.Affected if MediaController.java with an Upload function processing imgFile parameter exists in the application
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Check if upload functionality is web-accessibleExamine the web application routing configuration (such as web.xml or Spring MVC annotations) to determine if the MediaController upload endpoint is mapped and accessible via HTTP/HTTPS.Affected if The upload endpoint is publicly accessible without additional authentication barriers
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Inspect upload directories for suspicious filesExamine the directories where uploaded files are stored (commonly /media/, /uploads/, or similar paths within the web application root). List all files and check for unexpected extensions such as .jsp, .exe, .php, .sh, .jar, or other executable types.Affected if Files with executable extensions (.jsp, .php, .exe, .sh, .jar, .war) exist in upload directories, especially with random or unusual filenames
You are affected if you are running youkefu version 4.0 through 4.2.0 and the MediaController upload endpoint is accessible, as the imgFile parameter lacks proper validation allowing arbitrary file uploads.
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 server-side file type validation using magic byte detection, enforce allowlisted file extensions only, and store uploaded files outside the web root with random filenames to prevent execution.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-4258 — 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-2025-4258 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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