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
415 results · Clear filters · Feed
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High 8.1CVE-2026-10818 Public exploit
WPForms Pro <= 1.10.1.1 - Unauthenticated Arbitrary File Write via Chunked Upload Init/Finalize Ordering
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Critical 9.8CVE-2026-14282 Public exploit
GoDAM <= 1.12.2 - Unauthenticated Arbitrary File Upload via WPForms File Upload Field
The GoDAM – Organize WordPress Media Library & File Manager with Unlimited Folders for Images, Videos & more plugin for WordPress is vulnerable to arbitrary file uploads in versions up to, and including, 1.12.2. This is due to insufficient file type validatio…
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Critical 10.0CVE-2026-61424 Public exploit
Joomla Extension - dj-extensions.com - Unauthenticated arbitrary file upload in DJ-Classifieds < 3.11.2
Joomla Extension - dj-extensions.com - Unauthenticated arbitrary file upload in DJ-Classifieds < 3.11.2 - The Joomla extension DJ-Classifieds is vulnerable to an unauthenticated file upload, leading to full RCE.
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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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Medium 6.5CVE-2026-12684 Public exploit
Customer Reviews for WooCommerce < 5.113.0 - Unauthenticated Arbitrary Media Upload via cr_upload_media
The Customer Reviews for WooCommerce WordPress plugin before 5.113.0 does not perform authentication, capability, or nonce checks on one of its media upload AJAX actions when the review media attachment feature is enabled, allowing unauthenticated users to up…
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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
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High 8.8CVE-2026-23697 Public exploit
Vtiger CRM < 8.4.0 Authenticated File Upload RCE via Documents Module
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High 7.2CVE-2026-23698 Public exploit
Vtiger CRM 8.4.0 Authenticated RCE via Module Import File Upload
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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 -
Critical 10.0
Joomla Extension - joomshaper.com - Remote Code Execution in SP Pagebuilder extension for Joomla < 6.6.2
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KEV Jul 7, 2026 -
Critical 10.0
Joomla Extension - icagenda.com - Remote Code Execution in iCaganda extension for Joomla < 4.0.8/3.9.15
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KEV Jul 10, 2026 -
Critical 9.8CVE-2026-53787 Public exploit
Amasty Order Attributes for Magento 2 < 4.0.0 Unauthenticated Arbitrary File Upload
Amasty Order Attributes for Magento 2 before version 4.0.0 contains an unauthenticated arbitrary file upload vulnerability that allows unauthenticated attackers to write arbitrary files to the store's media directory by submitting files of any type or name to…
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Critical 9.1CVE-2026-9067 Public exploit
Schema & Structured Data for WP & AMP < 1.60 - Unauthenticated Arbitrary Media Upload
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High 7.2CVE-2026-7537 Public exploit
MDJM Event Management <= 1.7.8.3 - Authenticated (Administrator+) Arbitrary File Upload via 'mdjm_email_upload_file' Parameter
The MDJM Event Management plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.7.8.3 via the mdjm_send_comm_email function. This is due to no file type, extension, or MIME type validation being performed on uploa…
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High 8.8CVE-2026-5411 Public exploit
WP Captcha PRO <= 5.38 - Missing Authorization to Authenticated (Subscriber+) Arbitrary File Upload
The WP Captcha PRO (the premium version of the Advanced Google reCAPTCHA plugin, both have the same slug) plugin for WordPress is vulnerable to arbitrary file upload in all versions up to, and including, 5.38. This is due to a capability check in the save_aja…
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High 7.3CVE-2026-11344 Public exploit
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High 7.3CVE-2026-39292 Public exploit
Falco Solutions PHPPageBuilder v0.31.0 contains an unrestricted file upload vulnerability in the pagemanager/pagebuilde…
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Medium 6.3CVE-2026-42879 Public exploit
FacturaScripts: Authenticated Remote Code Execution (RCE) via GIF Image Upload in Product Images
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Critical 9.8CVE-2026-4883 Public exploit
Piotnet Forms <= 2.1.40 - Unauthenticated Arbitrary File Upload via Form File Upload
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Critical 9.8CVE-2026-4885 Public exploit
Piotnet Addons for Elementor Pro <= 7.1.70 - Unauthenticated Arbitrary File Upload via Form File Upload
The Piotnet Addons for Elementor Pro plugin for WordPress is vulnerable to arbitrary file upload due to missing file type validation in the 'pafe_ajax_form_builder' function in all versions up to, and including, 7.1.70. The plugin uses an incomplete extension…
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Medium 6.3CVE-2025-67886 Public exploit
Bitrix24 through 25.100.300 allows Remote Code Execution because an actor with SOURCE/WRITE permissions for the Transla…
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High 7.2CVE-2026-38751 Public exploit
OpenSTAManager contains an arbitrary file upload vulnerability in its module update functionality
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Critical 9.8CVE-2026-4882 Public exploit
User Registration Advanced Fields <= 1.6.20 - Unauthenticated Arbitrary File Upload
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Medium 4.7CVE-2026-7393 Public exploit
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Critical 9.8
Breeze Cache <= 2.4.4 - Unauthenticated Arbitrary File Upload via fetch_gravatar_from_remote
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High 7.2CVE-2026-37748 Public exploit
Visitor Management System 1.0 by sanjay1313 is vulnerable to Unrestricted File Upload in vms/php/admin_user_insert.php …
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High 8.9CVE-2026-40487 Public exploit
Postiz Has Unrestricted File Upload via MIME Type Spoofing that Leads to Stored XSS
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High 8.1CVE-2026-5718 Public exploit
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Critical 9.9CVE-2026-38526 Public exploit
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Critical 9.8
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High 8.7CVE-2026-25099 Public exploit
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Critical 9.8CVE-2026-32985 Public exploit
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Critical 9.0CVE-2026-27540 Public exploit
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