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
414 results · Clear filters · Feed
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High 8.8CVE-2026-29041 Public exploit
Chamilo: Authenticated Remote Code Execution via Unrestricted File Upload
Chamilo is a learning management system. Prior to version 1.11.34, Chamilo LMS is affected by an authenticated remote code execution vulnerability caused by improper validation of uploaded files. The application relies solely on MIME-type verification when ha…
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Critical 10.0CVE-2026-21628 Public exploit
Extension - astroidframe.work - Unauthenticated Remote Code Execution in Astroid Framework 2.0.0 - 3.3.10 for Joomla
A improperly secured file management feature allows uploads of dangerous data types for unauthenticated users, leading to remote code execution.
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Critical 10.0
FreeScout 1.8.206 Patch Bypass for CVE-2026-27636 via Zero-Width Space Character Leads to Remote Code Execution
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High 8.8CVE-2026-27636 Public exploit
FreeScout: Missing .htaccess in Restricted File Extensions Allows Remote Code Execution on Apache
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.206, FreeScout's file upload restriction list in `app/Misc/Helper.php` does not include `.htaccess` or `.user.ini` files. On Apache servers with `AllowOver…
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High 8.8CVE-2026-26746 Public exploit
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Critical 9.8
Slider Future <= 1.0.5 - Unauthenticated Arbitrary File Upload
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Critical 9.8
midi-Synth <= 1.1.0 - Unauthenticated Arbitrary File Upload via 'export' AJAX Action
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Critical 9.8
Migration, Backup, Staging <= 0.9.123 - Unauthenticated Arbitrary File Upload
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High 8.8CVE-2025-69906 Public exploit
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Critical 9.8CVE-2025-61506 Public exploit
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Medium 6.1CVE-2025-70849 Public exploit
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Critical 10.0CVE-2026-24897 Public exploit
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High 7.5CVE-2026-0911 Public exploit
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Critical 10.0CVE-2025-68001 Public exploit
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High 8.5CVE-2026-23499 Public exploit
Saleor vulnerable to stored XSS via Unrestricted File Upload
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Medium 4.7CVE-2025-15495 Public exploit
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High 7.3CVE-2026-22241 Public exploit
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Critical 10.0
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Critical 9.8CVE-2025-67325 Public exploit
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Medium 6.8CVE-2025-66837 Public exploit
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Critical 10.0
Upload Arbitrary Files
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KEV Jan 26, 2026 -
Critical 9.8CVE-2025-57460 Public exploit
File upload vulnerability in machsol machpanel 8.0.32 allows attacker to gain a webshell.
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Critical 9.1CVE-2025-68109 Public exploit
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Critical 9.8CVE-2025-12673 Public exploit
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High 7.6CVE-2025-65027 Public exploit
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Critical 9.8CVE-2025-13597 Public exploit
AI Feeds <= 1.0.11 - Unauthenticated Arbitrary File Upload
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Critical 9.8CVE-2025-13595 Public exploit
CIBELES AI <= 1.10.8 - Unauthenticated Arbitrary File Upload
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High 7.2CVE-2025-12973 Public exploit
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High 8.8CVE-2025-13156 Public exploit
Vitepos – Point of Sale (POS) for WooCommerce <= 3.3.0 - Authenticated (Subscriber+) Arbitrary File Upload to Remote Code Execution
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Critical 9.8CVE-2025-11170 Public exploit
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High 7.2CVE-2025-12399 Public exploit
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Critical 9.3
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Critical 9.8CVE-2025-12674 Public exploit
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Critical 10.0
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Critical 9.8
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