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 10.0
Joomla Extension - joomshaper.com - Remote Code Execution in SP Pagebuilder extension for Joomla < 6.6.2
A vulnerability in SP Page Builder for Joomla allows unauthenticated users to upload arbitrary files, ultimately resulting in the upload and execution of PHP code.
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
A vulnerability in the iCagenda extension for Joomla allows the upload of arbitrary files in the file attachment feature, ultimately resulting in PHP code upload and execution.
KEV Jul 10, 2026 -
Critical 9.8
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
The Schema & Structured Data for WP & AMP WordPress plugin before 1.60 does not check user capabilities on its frontend AJAX file-upload handlers and does not validate the actual content of uploaded files against the endpoint's intended media type, allowing u…
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Critical 9.8
Piotnet Forms <= 2.1.40 - Unauthenticated Arbitrary File Upload via Form File Upload
The Piotnet Forms plugin for WordPress is vulnerable to arbitrary file upload due to missing file type validation in the 'piotnetforms_ajax_form_builder' function in all versions up to, and including, 2.1.40. The plugin uses an incomplete extension blacklist …
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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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Critical 9.8CVE-2026-4882 Public exploit
User Registration Advanced Fields <= 1.6.20 - Unauthenticated Arbitrary File Upload
The User Registration Advanced Fields plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'URAF_AJAX::method_upload' function in all versions up to, and including, 1.6.20. This makes it possible for unauthen…
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Critical 9.8
Breeze Cache <= 2.4.4 - Unauthenticated Arbitrary File Upload via fetch_gravatar_from_remote
The Breeze Cache plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'fetch_gravatar_from_remote' function in all versions up to, and including, 2.4.4. This makes it possible for unauthenticated attackers to…
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Critical 9.8CVE-2026-1555 Public exploit
WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload
The WebStack theme for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the io_img_upload() function in all versions up to, and including, 1.2024. This makes it possible for unauthenticated attackers to upload arbitrary…
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Critical 9.9CVE-2026-38526 Public exploit
An authenticated arbitrary file upload vulnerability in the /admin/tinymce/upload endpoint of Webkul Krayin CRM v2.2.x …
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Critical 9.8
Ninja Forms - File Upload <= 3.3.26 - Unauthenticated Arbitrary File Upload
The Ninja Forms - File Uploads plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'NF_FU_AJAX_Controllers_Uploads::handle_upload' function in all versions up to, and including, 3.3.26. This makes it possibl…
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Critical 9.8CVE-2026-32985 Public exploit
Xerte Online Toolkits <= 3.14 Unauthenticated Template Import Arbitrary File Upload Leading to Remote Code Execution
Xerte Online Toolkits versions 3.14 and earlier contain an unauthenticated arbitrary file upload vulnerability in the template import functionality that allows remote attackers to execute arbitrary code by uploading a crafted ZIP archive containing malicious …
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Critical 9.0CVE-2026-27540 Public exploit
WordPress Woocommerce Wholesale Lead Capture plugin <= 2.0.3.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Rymera Web Co Pty Ltd. Woocommerce Wholesale Lead Capture allows Using Malicious Files. This issue affects Woocommerce Wholesale Lead Capture: through 2.0.3.1.
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Critical 9.8
Pix for WooCommerce <= 1.5.0 - Unauthenticated Arbitrary File Upload
The Pix for WooCommerce plugin for WordPress is vulnerable to arbitrary file uploads due to missing capability check and missing file type validation in the 'lkn_pix_for_woocommerce_c6_save_settings' function in all versions up to, and including, 1.5.0. This …
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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
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. A patch bypass vulnerability for CVE-2026-27636 in FreeScout 1.8.206 and earlier allows any authenticated user with file upload permissions to achieve Remote Code Execution (RC…
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Critical 9.8
Slider Future <= 1.0.5 - Unauthenticated Arbitrary File Upload
The Slider Future plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'slider_future_handle_image_upload' function in all versions up to, and including, 1.0.5. This makes it possible for unauthenticated atta…
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Critical 9.8
midi-Synth <= 1.1.0 - Unauthenticated Arbitrary File Upload via 'export' AJAX Action
The midi-Synth plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type and file extension validation in the 'export' AJAX action in all versions up to, and including, 1.1.0. This makes it possible for unauthenticated attackers to…
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Critical 9.8
Migration, Backup, Staging <= 0.9.123 - Unauthenticated Arbitrary File Upload
The Migration, Backup, Staging – WPvivid Backup & Migration plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Upload in versions up to and including 0.9.123. This is due to improper error handling in the RSA decryption process combined with…
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Critical 9.8CVE-2025-61506 Public exploit
An issue was discovered in MediaCrush thru 1.0.1 allowing remote unauthenticated attackers to upload arbitrary files of…
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Critical 10.0CVE-2026-24897 Public exploit
Authenticated Remote Code Execution via Arbitrary File Upload
Erugo is a self-hosted file-sharing platform. In versions up to and including 0.2.14, an authenticated low-privileged user can upload arbitrary files to any specified location due to insufficient validation of user‑supplied paths when creating shares. By spec…
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Critical 9.8CVE-2025-13374 Public exploit
Kalrav AI Agent <= 2.3.3 - Unauthenticated Arbitrary File Upload via kalrav_upload_file AJAX Action
The Kalrav AI Agent plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the kalrav_upload_file AJAX action in all versions up to, and including, 2.3.3. This makes it possible for unauthenticated attackers to upl…
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Critical 10.0CVE-2025-68001 Public exploit
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 9.8CVE-2025-66802 Public exploit
Sourcecodester Covid-19 Contact Tracing System 1.0 is vulnerable to RCE (Remote Code Execution). The application receiv…
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Critical 10.0
n8n is vulnerable to Remote Code Execution via Arbitrary File Write
n8n is an open source workflow automation platform. In versions 0.121.2 and below, an authenticated attacker may be able to execute malicious code using the n8n service. This could result in full compromise and can impact both self-hosted and n8n Cloud instan…
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Critical 9.8CVE-2025-67325 Public exploit
Unrestricted file upload in the hotel review feature in QloApps versions 1.7.0 and earlier allows remote unauthenticate…
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Critical 10.0
Upload Arbitrary Files
Successful exploitation of the vulnerability could allow an unauthenticated attacker to upload arbitrary files to any location on the mail server, potentially enabling remote code execution.
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
ChurchCRM vulnerable to RCE with database restore functionality
ChurchCRM is an open-source church management system. In versions prior to 6.5.3, the Database Restore functionality does not validate the content or file extension of uploaded files. As a result, an attacker can upload a web shell file and subsequently uploa…
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Critical 9.8CVE-2025-12673 Public exploit
Flex QR Code Generator <= 1.2.7 - Unauthenticated Arbitrary File Upload
The Flex QR Code Generator plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the update_qr_code() function in all versions up to, and including, 1.2.7. This makes it possible for unauthenticated attackers to u…
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Critical 9.8CVE-2025-13597 Public exploit
AI Feeds <= 1.0.11 - Unauthenticated Arbitrary File Upload
The AI Feeds plugin for WordPress is vulnerable to arbitrary file uploads due to missing capability check in the 'actualizador_git.php' file in all versions up to, and including, 1.0.11. This makes it possible for unauthenticated attackers to download arbitra…
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Critical 9.8CVE-2025-13595 Public exploit
CIBELES AI <= 1.10.8 - Unauthenticated Arbitrary File Upload
The CIBELES AI plugin for WordPress is vulnerable to arbitrary file uploads due to missing capability check in the 'actualizador_git.php' file in all versions up to, and including, 1.10.8. This makes it possible for unauthenticated attackers to download arbit…
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Critical 9.8CVE-2025-11170 Public exploit
WP移行専用プラグイン for CPI <= 1.0.2 - Unauthenticated Arbitrary File Upload
The WP移行専用プラグイン for CPI plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the Cpiwm_Import_Controller::import function in all versions up to, and including, 1.0.2. This makes it possible for unauthenticated at…
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Critical 9.3
Monsta FTP <= 2.11 Unauthenticated Arbitrary File Upload
Monsta FTP versions 2.11 and earlier contain a vulnerability that allows unauthenticated arbitrary file uploads. This flaw enables attackers to execute arbitrary code by uploading a specially crafted file from a malicious (S)FTP server.
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Critical 9.8CVE-2025-12674 Public exploit
KiotViet Sync <= 1.8.5 - Unauthenticated Arbitrary File Upload
The KiotViet Sync plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the create_media() function in all versions up to, and including, 1.8.5. This makes it possible for unauthenticated attackers to upload arbit…
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Critical 10.0
DNN Insufficient Access Control - Image Upload allows for Site Content Overwrite
DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to 10.1.1, the default HTML editor provider allows unauthenticated file uploads and images can overwrite existing files. An unauthenticated use…
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Critical 9.8
WooCommerce Designer Pro <= 1.9.26 - Unauthenticated Arbitrary File Upload
The WooCommerce Designer Pro plugin for WordPress, used by the Pricom - Printing Company & Design Services WordPress theme, is vulnerable to arbitrary file uploads due to missing file type validation in the 'wcdp_save_canvas_design_ajax' function in all versi…
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Critical 9.8CVE-2025-11391 Public exploit
PPOM – Product Addons & Custom Fields for WooCommerce <= 33.0.15 - Unauthenticated Arbitrary File Upload
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Critical 9.8CVE-2025-56218 Public exploit
An arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers to execute arbitrary code via uploading a …
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Critical 9.8CVE-2025-10041 Public exploit
Flex QR Code Generator <= 1.2.5 - Unauthenticated Arbitrary File Upload
The Flex QR Code Generator plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in thesave_qr_code_to_db() function in all versions up to, and including, 1.2.5. This makes it possible for unauthenticated attackers t…