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
1,154 results · Clear filters · Feed
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Critical 9.8
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Critical 9.8
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Critical 10.0
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Critical 10.0CVE-2026-24897 Public exploit
Authenticated Remote Code Execution via Arbitrary File Upload
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Critical 9.9
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Critical 9.1
Unrestricted File Upload Vulnerability in Explorance Blue
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Critical 10.0
A XStream Security Vulnerability in XML Deserialization in datavane/tis
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Critical 9.8
code-projects Computer Book Store 1.0 is vulnerable to File Upload in admin_add.php.
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Critical 9.8
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Critical 9.8CVE-2025-13374 Public exploit
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Critical 9.8
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Critical 9.1
WordPress Xpro Elementor Addons plugin <= 1.4.19.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Xpro Xpro Elementor Addons xpro-elementor-addons allows Upload a Web Shell to a Web Server.This issue affects Xpro Elementor Addons: from n/a through <= 1.4.19.1.
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Critical 9.9
WordPress Miion theme <= 1.2.7 - Arbitrary File Upload vulnerability
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Critical 9.9
WordPress Blogzee theme <= 1.0.5 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in blazethemes Blogzee blogzee allows Using Malicious Files.This issue affects Blogzee: from n/a through <= 1.0.5.
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Critical 9.9
WordPress Blogistic theme <= 1.0.5 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in blazethemes Blogistic blogistic allows Using Malicious Files.This issue affects Blogistic: from n/a through <= 1.0.5.
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WordPress g-FFL Checkout plugin <= 2.1.0 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in garidium g-FFL Checkout g-ffl-checkout allows Upload a Web Shell to a Web Server.This issue affects g-FFL Checkout: from n/a through <= 2.1.0.
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Critical 9.9
WordPress Real Homes CRM plugin <= 1.0.0 - Arbitrary File Upload vulnerability
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Critical 9.9
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Critical 9.9
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Unrestricted Upload of File with Dangerous Type vulnerability in blazethemes News Event news-event.This issue affects News Event: from n/a through <= 1.0.1.
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Critical 10.0
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Critical 9.8
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Critical 10.0
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Critical 9.3
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Critical 9.3
Uploadify <= 1.0 Unauthenticated Arbitrary File Upload
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Critical 9.8
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Critical 9.8
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Critical 9.8
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Critical 9.8
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Critical 9.8
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Critical 9.8
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Critical 9.3
emlog Arbitrary File Upload Vulnerability
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Critical 9.6
Iris Allows Arbitrary File Deletion via Mass Assignment in Datastore File Management
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Critical 9.9
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Critical 9.1
WordPress Contentstudio plugin <= 1.3.7 - Arbitrary File Upload vulnerability
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Critical 9.8
WP Cost Estimation <= 9.642 - Missing Authorization to Arbitrary File Upload/Delete
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Critical 10.0
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