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 Online Faculty Clearance System Profile Picture Upload edit_picture.php move_uploaded_file unrestricted upload
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Medium 6.6
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Medium 5.3
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Medium 6.6
HotelDruid before 3.0.6 has insufficient file upload sanitation in the backup/restore function.
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Medium 6.3
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Medium 6.3
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Medium 5.3
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Medium 5.4
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Medium 5.5
InstantCMS has Remote Code Execution in package installer
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Medium 5.3
liufee FeehiCMS UEditor Widget UeditorAction.php init unrestricted upload
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Medium 6.3
itsourcecode Online Medicine Delivery System Customer Controller controller.php doupdateimage unrestricted upload
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Medium 6.3
ILIAS MediaPool ZipAdapter.php uploadMultipleSubtitleFileObject unrestricted upload
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Medium 4.4
backpack/crud: SingleBase64Image accepts any base64 payload behind a `data:image` prefix — SVG-with-script lands on the public disk
backpack/crud provides Create, Read, Update & Delete (CRUD) functions for Backpack, a collection of Laravel packages that help users build custom administration panels. From 6.0.0 until 6.8.14 and 7.0.37, the src/app/Library/Uploaders/SingleBase64Image.php me…
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Medium 6.3
diem-project diem Widget Editor dmWidgetContentBaseMediaForm.php unrestricted upload
A security flaw has been discovered in diem-project diem up to 5.1.3. The impacted element is an unknown function of the file dmFrontPlugin/lib/dmWidget/media/dmWidgetContentBaseMediaForm.php of the component Widget Editor. Performing a manipulation results i…
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Medium 4.7
jeecgboot jeewx-boot doUpload Endpoint MyJwWebJwid3Controller.java MyJwWebJwid3Controller.doUpload unrestricted upload
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Medium 5.3
Breeze Cache < 2.5.13 - Unauthenticated File Creation via Cache Path Traversal
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Medium 4.8
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Medium 4.6
tamguo 1.5.3 is vulnerable to Unrestricted File Upload Leading to Stored XSS. The /uploadFile and /imgUpload endpoints …
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Medium 6.5
ContiNew Admin through 4.1.0 Missing Authorization and File-Type Allowlist on Multipart Upload Endpoints
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Medium 5.3
Reachy Mini: Unrestricted Upload of File with Dangerous Type
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Medium 4.8
Ech0 before 4.4.3 Stored XSS via SVG Upload
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Medium 4.8
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Unrestricted Upload of File with Dangerous Type in the company logo upload in Roskus Prospero Flow CRM before 5.15.13 allows an authenticated user holding the create company and update company permissions to execute arbitrary JavaScript in the application ori…
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Medium 6.1
CyberTutor｜NewSiteServer (NSS) - Arbitrary File Upload
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Medium 6.3
CodeAstro Online Job Portal update-profile.php unrestricted upload
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Medium 4.7
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Medium 6.3
DeDeCMS select_media_post.php unrestricted upload
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Medium 6.3
OpenBoxes Document Upload Controller DocumentController.groovy DocumentController unrestricted upload
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Medium 4.7
SourceCodester Simple Doctors Appointment System save_file.php save_doctor unrestricted upload
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Medium 6.5
Release attachment extension allowlist bypass via web release edit form (variant of CVE-2025-68939)
Release attachment extension allowlist bypass via web release edit form (variant of CVE-2025-68939)
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Medium 6.8
WhatsUp Gold versions prior to 26.0.2 contain an arbitrary file write vulnerability in the LogToFile action handler.
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Medium 6.5
Wildfly-core: wildfly: arbitrary file read via malicious archive deployment
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Medium 4.7
saithink/saigroup SaiAdmin Plugin Upload Endpoint upload shell_exec unrestricted upload
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Medium 6.3
SourceCodester Photo Share Website ajax.php save_upload unrestricted upload
A vulnerability has been found in SourceCodester Photo Share Website 1.0. The impacted element is an unknown function of the file /social/ajax.php?action=save_upload. Such manipulation of the argument img[]/imgName[] leads to unrestricted upload. The attack m…
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Medium 5.3
Statamic: Missing file upload validation on frontend forms allows uploading disallowed file types
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Medium 6.3
SourceCodester Online Examination & Learning Management System upload_files.php unrestricted upload
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Medium 6.3
imranrisal-dev Student-Management-System Shared Upload Helper student_profile_pic.php storeProfileImage unrestricted upload
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Medium 6.5
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Medium 4.8
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