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 9.9
WordPress Grip theme <= 1.0.9 - Arbitrary Plugin Activation/Deactivation to RCE vulnerability
Subscriber Arbitrary File Upload in Grip <= 1.0.9 versions.
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Critical 9.9
WordPress Kids Online Store theme <= 0.8.9 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in themagnifico52 Kids Online Store allows Upload a Web Shell to a Web Server. This issue affects Kids Online Store: from n/a through 0.8.9.
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Critical 10.0
WordPress GeekyBot plugin <= 1.2.2 - Arbitrary File Upload vulnerability
Unauthenticated Arbitrary File Upload in GeekyBot <= 1.2.2 versions.
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Critical 9.9
WordPress WP-BusinessDirectory plugin <= 4.0.0 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in WP-BusinessDirectory <= 4.0.0 versions.
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Critical 9.8
WordPress Plugin Baggage Freight Shipping Australia 0.1.0 Arbitrary File Upload
WordPress Plugin Baggage Freight Shipping Australia 0.1.0 contains an unrestricted file upload vulnerability that allows unauthenticated attackers to upload arbitrary files by exploiting the upload-package.php endpoint. Attackers can submit POST requests with…
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Critical 9.3
Remote Code Execution via Unrestricted File Upload in Responsive FileManager
Responsive FileManager's allows an unauthenticated attacker to upload files of any type and extension without restriction using dialog.php endpoint, leading to Remote Code Execution. This project is unmaintained at the time of CVE assignment. The vulnerabili…
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Critical 9.8
An arbitrary file upload vulnerability in the attachment handling component of flatnotes v5.5.4 allows attackers to exe…
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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 9.9
Arbitrary File Upload in Basarsoft's Rotaban
Unrestricted upload of file with dangerous type vulnerability in Başarsoft Information Technologies Inc. Rotaban allows Upload a Web Shell to a Web Server. This issue affects Rotaban: from V2026.06.002 before V2026.06.003.
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Critical 9.8
Unrestricted File Upload in Limatek's LimRAD NAC
Unrestricted upload of file with dangerous type vulnerability in Limatek System Inc. LimRAD NAC allows Remote Code Inclusion. This issue affects LimRAD NAC: before 5.5.7.3.9.
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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
WordPress Theme Travelscape 1.0.3 Arbitrary File Upload
WordPress Theme Travelscape 1.0.3 contains an arbitrary file upload vulnerability that allows unauthenticated attackers to upload malicious files by exploiting insufficient validation in the theme's upload functionality. Attackers can upload arbitrary files t…
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Critical 9.8
WordPress Background Image Cropper 1.2 Remote Code Execution
WordPress Background Image Cropper version 1.2 contains a remote code execution vulnerability that allows unauthenticated attackers to upload arbitrary files by accessing the ups.php endpoint. Attackers can upload PHP files through the file upload form in the…
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Critical 9.4
Path Traversal in Altium Enterprise Server Vault UploadController Allows Arbitrary File Write
A path traversal vulnerability exists in the Altium Enterprise Server Vault Service UploadController due to improper validation of a user-controlled path component in image upload requests. An authenticated user can supply a crafted absolute path so that the …
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Critical 9.8
Interinfo｜DreamMaker - Arbitrary File Upload
DreamMaker developed by Interinfo has an Arbitrary File Upload vulnerability, allowing unauthenticated remote attackers to upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.
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Critical 9.9
WordPress WPify Woo Czech plugin <= 5.4.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in WPify WPify Woo Czech wpify-woo allows Upload a Web Shell to a Web Server.This issue affects WPify Woo Czech: from n/a through <= 5.4.1.
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Critical 10.0
Azure Orbital Spatio Remote Code Execution Vulnerability
Unrestricted upload of file with dangerous type in Azure Orbital Spatio allows an unauthorized attacker to execute code over a network.
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Critical 9.8
BookingPress Pro <= 5.6 - Unauthenticated Arbitrary File Upload via Signature Custom Field
The BookingPress Pro plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'bookingpress_validate_submitted_booking_form_func' function in all versions up to, and including, 5.6. This makes it possible for una…
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Critical 9.4
Concrete CMS 9.5.0 and below is vulnerable to Authenticated RCE via Composer customTemplate Path Traversal leading to PHP File Inclusion
Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTemplate field when saving page type composer form layouts. An authenticated rogue administrator with composer form editing rights can exploit t…
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Critical 10.0
WordPress Gift Cards For WooCommerce Pro plugin <= 4.2.6 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in WP Swings Gift Cards For WooCommerce Pro allows Using Malicious Files. This issue affects Gift Cards For WooCommerce Pro: from n/a through 4.2.6.
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Critical 9.4
Path Traversal in Altium Enterprise Server ComparisonService Allows Arbitrary File Write
A path traversal vulnerability exists in the Altium Enterprise Server ComparisonService due to missing filename sanitization in the Gerber file upload APIs. A regular authenticated workspace user can supply a crafted filename in the multipart Content-Disposit…
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Critical 9.8
ProSolution WP Client <= 2.0.0 - Unauthenticated Arbitrary File Upload via 'files'
The ProSolution WP Client plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 2.0.0. This is due to an array validation mismatch where only the first file in the upload array undergoes extension and MIME type validati…
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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 9.8
WordPress Plugin WP Super Edit 2.5.4 Unrestricted File Upload
WordPress Plugin WP Super Edit 2.5.4 and earlier contains an unrestricted file upload vulnerability in the FCKeditor component that allows attackers to upload dangerous file types without validation. Attackers can upload arbitrary files through the filemanage…
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Critical 9.8
Career Section <= 1.7 - Unauthenticated Arbitrary File Upload
The Career Section plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.7 via the CV upload handler. This is due to missing file type validation. This makes it possible for unauthenticated attackers to upload fil…
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Critical 9.1
CubeCart: Authenticated Arbitrary File Upload to RCE in REST Files API
CubeCart is an ecommerce software solution. Prior to 6.7.0, an Authenticated Arbitrary File Upload vulnerability exists in the REST API File Manager endpoint (POST /api/v1/files) of CubeCart. The endpoint allows any holder of an API key with files:rw permissi…
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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
Weaver E-office < 10.0_20221201 Unauthenticated Arbitrary File Read via XmlRpcServlet
Weaver (Fanwei) E-office versions prior to 10.0_20221201 contain an unauthenticated arbitrary file upload vulnerability in the OfficeServer.php endpoint that allows remote attackers to upload malicious files by sending multipart POST requests with arbitrary f…
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Critical 9.8
BorG Technology Corporation｜Borg SPM 2007 - Arbitrary File Upload
Borg SPM 2007 (Sales Ended in 2008) developed by BorG Technology Corporation has an Arbitrary File Upload vulnerability, allowing unauthenticated remote attackers to upload and execute web shell backdoors, thereby enabling arbitrary code execution on the serv…
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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 9.3
Seeyon Office Anywhere (OA) A8 Unauthenticated Arbitrary File Write via htmlofficeservlet
Seeyon OA A8 contains an unauthenticated arbitrary file write vulnerability in the /seeyon/htmlofficeservlet endpoint that allows remote attackers to write arbitrary files to the web application root by sending specially crafted POST requests with custom base…
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Critical 9.1
Vvveb CMS < v1.0.8.2 Remote Code Execution via Media Management
Vvveb CMS before 1.0.8.2 contains a remote code execution vulnerability in its media management functionality where a missing return statement in the file rename handler allows authenticated attackers to rename files to blocked extensions .php or .htaccess. A…
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Critical 9.1
ChurchCRM: Authenticated Remote Code Execution via Unrestricted PHP File Write in Database Restore Function
ChurchCRM is an open-source church management system. In versions prior to 7.2.0, the database backup restore functionality extracts uploaded archive contents and copies files from the Images/ directory into the web-accessible document root using recursiveCop…
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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
ProSolution WP Client <= 1.9.9 - Unauthenticated Arbitrary File Upload via proSol_fileUploadProcess
The ProSolution WP Client plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'proSol_fileUploadProcess' function in all versions up to, and including, 1.9.9. This makes it possible for unauthenticated attac…
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Critical 9.8
DSGVO Google Web Fonts GDPR <= 1.1 - Unauthenticated Arbitrary File Upload via 'fonturl' Parameter
The DSGVO Google Web Fonts GDPR plugin for WordPress is vulnerable to arbitrary file upload due to missing file type validation in the `DSGVOGWPdownloadGoogleFonts()` function in all versions up to, and including, 1.1. The function is exposed via a `wp_ajax_n…
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Critical 9.1
ChurchCRM has a Path traversal leads to RCE
ChurchCRM is an open-source church management system. Prior to 6.5.3, a path traversal vulnerability in ChurchCRM's backup restore functionality allows authenticated administrators to upload arbitrary files and achieve remote code execution by overwriting Apa…
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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…