Weakness (CWE)
CWE-434: Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
How to prevent it (8 mitigations)
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Architecture and Design
Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.[REF-422] [REF-423]
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Architecture and Design
When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
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Architecture and Design
Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically. [REF-423]
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Implementation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
For example, limiting filenames to alphanumeric characters can help to restrict the introduction of unintended file extensions.
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Architecture and Design
Define a very limited set of allowable extensions and only generate filenames that end in these extensions. Consider the possibility of XSS (CWE-79) before allowing .html or .htm file types.
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Implementation
Ensure that only one extension is used in the filename. Some web servers, including some versions of Apache, may process files based on inner extensions so that "filename.php.gif" is fed to the PHP interpreter.[REF-422] [REF-423]
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Implementation
When running on a web server that supports case-insensitive filenames, perform case-insensitive evaluations of the extensions that are provided.
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Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Source: MITRE CWE-434
936 results · Clear filters · Feed
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Medium 6.3
SourceCodester Web-based Pharmacy Product Management System add-product.php unrestricted upload
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Medium 6.3
SourceCodester Web-based Pharmacy Product Management System edit-photo.php unrestricted upload
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Medium 6.3
SourceCodester Web-based Pharmacy Product Management System edit-product.php unrestricted upload
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Medium 5.3
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Medium 6.6CVE-2025-39538 Public exploit
WordPress WP-Advanced-Search plugin <= 3.3.9.4 - Arbitrary File Upload Vulnerability
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Medium 6.3
ZHENFENG13/code-projects My-Blog-layui authorImg upload unrestricted upload
A vulnerability was found in ZHENFENG13/code-projects My-Blog-layui 1.0. It has been declared as critical. This vulnerability affects the function Upload of the file /admin/upload/authorImg/. The manipulation of the argument File leads to unrestricted upload.…
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Medium 4.7
huanfenz/code-projects StudentManager Announcement Management Section uploadArticle.do unrestricted upload
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Medium 6.3
ghostxbh uzy-ssm-mall uploadUserHeadImage unrestricted upload
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Medium 6.5
WordPress Accessibility Suite plugin <= 4.18 - Arbitrary File Upload vulnerability
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Medium 6.3
mymagicpower AIAS LocalStorageController.java unrestricted upload
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Medium 6.3
godcheese/code-projects Nimrod FileRestController.java unrestricted upload
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Medium 5.5
IBM Maximo Application Suite file upload
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Medium 6.3
SourceCodester Web-based Pharmacy Product Management System Create User Page add-admin.php unrestricted upload
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Medium 5.0
Projeqtor saveAttachment.php unrestricted upload
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Medium 4.7
WonderCMS Theme Installation/Plugin Installation installUpdateModuleAction unrestricted upload
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Medium 4.7
Dell Wyse Management Suite, versions prior to WMS 5.1, contains an Unrestricted Upload of File with Dangerous Type vuln…
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Medium 6.3
Project Worlds Online Time Table Generator updateprofile.php unrestricted upload
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Medium 6.3
Project Worlds Online Time Table Generator updatestudent.php unrestricted upload
A vulnerability classified as critical has been found in Project Worlds Online Time Table Generator 1.0. This affects an unknown part of the file /admin/updatestudent.php. The manipulation of the argument pic leads to unrestricted upload. It is possible to in…
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Medium 6.3
Project Worlds Online Time Table Generator add_student.php unrestricted upload
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Medium 6.6
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Medium 6.3
WCMS Article Publishing Page CKEditor unrestricted upload
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Medium 6.3
code-projects College Management System student.php unrestricted upload
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Medium 6.3
Bluestar Micro Mall api.php unrestricted upload
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Medium 6.6
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Medium 6.3
Digiwin ERP UploadAjaxAPI.ashx unrestricted upload
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Medium 6.1
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Medium 6.3
Softwin WMX3 ImageAdd.ashx ImageAdd unrestricted upload
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Medium 6.3
PHPGurukul eLearning System Image index.php unrestricted upload
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Medium 6.3
Yue Lao Blind Box 月老盲盒 Upload.php base64image unrestricted upload
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Medium 6.3
phplaozhang LzCMS-LaoZhangBoKeXiTong HTTP POST Request upimage.html unrestricted upload
A vulnerability was found in phplaozhang LzCMS-LaoZhangBoKeXiTong up to 1.1.4. It has been rated as critical. Affected by this issue is some unknown functionality of the file /admin/upload/upimage.html of the component HTTP POST Request Handler. The manipulat…
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Medium 6.3
SourceCodester Best Church Management Software soulwinning_crud.php unrestricted upload
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Medium 6.6
Unrestricted File Upload and Execution in parisneo/lollms-webui
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Medium 4.7
IBM Security ReaQta file upload
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Medium 6.3
An arbitrary file upload vulnerability in the component /admin/template.php of emlog pro 2.5.0 and pro 2.5.* allows att…
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Medium 6.3
IROAD Dash Cam FX2 upload_file unrestricted upload
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Medium 6.3
zzskzy Warehouse Refinement Management System SaveCrash.ashx UploadCrash unrestricted upload
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Medium 6.3
zzskzy Warehouse Refinement Management System AcceptZip.ashx ProcessRequest unrestricted upload
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Medium 6.3
s-a-zhd Ecommerce-Website-using-PHP customer_register.php unrestricted upload
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Medium 6.3
ChestnutCMS upload uploadFile unrestricted upload
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