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
220 results · Clear filters · Feed
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Critical 10.0CVE-2026-110468 Public exploit
Remote Code Execution via Unrestricted File Upload in WidzialniCMS
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Critical 10.0CVE-2026-118423 Public exploit
WP Libre Form 1.5.0.1 - Unauthenticated RCE via Arbitrary File Upload
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Critical 9.8CVE-2026-116512 Public exploit
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Critical 9.8CVE-2026-103688 Public exploit
Checkout Files Upload for WooCommerce < 2.4.0 - Unauthenticated Arbitrary File Upload
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Critical 10.0CVE-2026-102785 Public exploit
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Critical 9.8CVE-2026-103889 Public exploit
3D Product configurator for WooCommerce <= 2.16.2 - Unauthenticated Remote Code Execution via 'xpv_image' Parameter
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Critical 10.0CVE-2026-94503 Public exploit
WordPress Zombify plugin <= 1.7.7 - Arbitrary File Upload vulnerability
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Critical 9.8CVE-2026-85097 Public exploit
Bricksforge <= 3.1.8.9 - Unauthenticated Arbitrary File Upload via 'temporaryFileUploads' Parameter
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Critical 10.0CVE-2026-102427 Public exploit
Joomla Extension - ordasoft.com - Unauthenticated Remote Code Execution in OrdaSoft Joomla CCK < 8.3.16
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Critical 9.8CVE-2026-82901 Public exploit
Ultra Addons for Contact Form 7 <= 3.5.50 - Unauthenticated Arbitrary File Upload via Signature Form Field
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Critical 9.5CVE-2026-94132 Public exploit
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Critical 9.8CVE-2026-18143 Public exploit
Request a Quote for WooCommerce <= 2.9.2 - Unauthenticated Arbitrary File Upload via AJAX Popup Handler
The Request a Quote for WooCommerce plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.9.2 via the `afrfq_submit_quote_via_popup()` function. This is due to missing file extension and MIME type validation in th…
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Critical 9.1CVE-2026-42322 Public exploit
Piwigo: Authenticated RCE via File Upload in Logo Upload Feature
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Critical 9.8CVE-2026-13249 Public exploit
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Critical 9.8CVE-2026-84434 Public exploit
Gravity Forms <= 3.1.0.4 - Unauthenticated Arbitrary File Upload via Hidden File Upload Field
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Critical 9.8CVE-2026-45140 Public exploit
Chamilo LMS CStudio upload flow allows unauthenticated remote code execution
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Critical 9.8CVE-2026-87796 Public exploit
Multi Uploader for Gravity Forms <= 1.1.9 - Unauthenticated Arbitrary File Upload via Chunked File Upload
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Critical 9.8CVE-2026-18351 Public exploit
Drag and Drop File Upload for Elementor Forms <= 1.6.0 - Unauthenticated Arbitrary File Upload via 'type' Parameter
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Critical 9.8CVE-2026-44402 Public exploit
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Critical 9.8CVE-2026-75865 Public exploit
WPLP Cookie Consent <= 4.4.1 - Unauthenticated Arbitrary File Upload via 'upload-logo' REST Endpoint
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Critical 10.0CVE-2026-81780 Public exploit
WordPress Hash Form plugin <= 1.4.2 - Arbitrary File Upload vulnerability
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Critical 9.4CVE-2026-77991 Public exploit
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Critical 9.8CVE-2026-18080 Public exploit
ERP: Complete HR, Accounting & CRM Suite Built for WooCommerce <= 1.17.8 - Unauthenticated Arbitrary File Upload via CRM Email Connect IMAP Attachment
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Critical 9.0CVE-2026-32475 Public exploit
WordPress Elementor Pro plugin <= 4.2.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Elementor Elementor Pro allows Using Malicious Files. This issue affects Elementor Pro: from n/a through 4.2.1.
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Critical 9.8CVE-2026-15748 Public exploit
Forminator Forms <= 1.56.1 - Unauthenticated Arbitrary File Upload via Forged Upload Field Configuration
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Critical 9.8CVE-2026-19089 Public exploit
Product Input Fields for WooCommerce < 2.0.2 - Unauthenticated Arbitrary File Upload
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Critical 9.8CVE-2026-14483 Public exploit
Realtyna Organic IDX plugin + WPL Real Estate <= 5.2.0 - Unauthenticated Arbitrary File Upload via 'files[file]' Parameter via Public I/O 'set_property' Command
The Realtyna Organic IDX plugin + WPL Real Estate plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 5.2.0 via the upload function. This is due to missing file type validation in the upload function, combined wit…
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Critical 9.8CVE-2026-63223 Public exploit
CodeIgniter: Uploaded file extension validation bypass in is_image and mime_in rules
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Critical 9.8CVE-2026-13714 Public exploit
Realtyna Organic IDX plugin + WPL Real Estate < 5.3.0 - Unauthenticated Arbitrary File Upload to Remote Code Execution
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Critical 9.8CVE-2026-14282 Public exploit
GoDAM <= 1.12.2 - Unauthenticated Arbitrary File Upload via WPForms File Upload Field
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Critical 10.0CVE-2026-61424 Public exploit
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Critical 9.8CVE-2026-36669 Public exploit
An unauthenticated arbitrary file upload vulnerability in ck_upload_handler.php in Feng Office 3.11.13.11 allows remote…
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Critical 9.3
Adobe Commerce | Unrestricted Upload of File with Dangerous Type (CWE-434)
Adobe Commerce is affected by an Unrestricted Upload of File with Dangerous Type vulnerability that could result in arbitrary code execution in the context of the current user, potentially gaining elevated access or control over the victim's account or sessio…
KEV Oct 27, 2026 -
Critical 10.0
Joomla Extension - rsjoomla.com - Unauthenticated file upload in RSFiles component < 1.17.12
Joomla Extension - rsjoomla.com - Unauthenticated file upload in RSFiles component < 1.17.12 - The Joomla extension RSFiles is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
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Critical 9.8CVE-2026-15282 Public exploit
Instant Appointment <= 1.2 - Unauthenticated Arbitrary File Upload
The Instant Appointment plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'insapp_upload_image_as_attachment' function in all versions up to, and including, 1.2. This makes it possible for unauthenticated …
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Critical 9.8CVE-2026-14894 Public exploit
Super Forms <= 6.3.313 - Unauthenticated Arbitrary File Upload via 'data' Parameter (datauristring / value)
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 6.3.313 via the submit_form function. This is due to missing file type validation and the absence of any capability ch…
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Critical 10.0
Joomla Extension - balbooa.com - Unauthenticated file upload in Balbooa Forms extension < 2.4.1
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KEV Jul 10, 2026 -
Critical 9.8CVE-2026-58480 Public exploit
Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments
Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Ad…
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Critical 9.8CVE-2026-5524 Public exploit
Divi Form Builder <= 5.1.8 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution via 'acceptFileTypes' Parameter
The Divi Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload leading to Remote Code Execution in all versions up to and including 5.1.8. This is due to insufficient file extension validation in the do_image_upload() function where user-su…
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Critical 10.0
Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0
Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0 - The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
KEV Jul 7, 2026