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
1,208 results · Clear filters · Feed
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High 8.1
elFinder: ZIP extraction bypasses uploadDeny MIME filter allowing PHP file upload (RCE)
elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, checkExtractItems() in php/elFinderVolumeDriver.class.php calls mimetypeInternalDetect() without passing the result through mimeTypeNormalize(). Because t…
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High 8.9
Joomla Extension - joomshaper.com - Privileged File Upload Bypass via Content Spoofing in Helix Ultimate < 2.2.10
Joomla Extension - joomshaper.com - Privileged File Upload Bypass via Content Spoofing in Helix Ultimate < 2.2.10 - Image uploads previously validated only file extension and basic size parameters. Non-image files disguised with raster extensions could be upl…
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High 7.3
Cozmoslabs Profile Builder Plugin Avatar Simple Upload AJAX admin-ajax.php wppb_ajax_simple_avatar unrestricted upload
A vulnerability was found in Cozmoslabs Profile Builder Plugin up to 3.16.1 on WordPress. The impacted element is the function wppb_ajax_simple_avatar of the file /wp-admin/admin-ajax.php of the component Avatar Simple Upload AJAX Handler. Performing a manipu…
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High 8.8
BookStack before 26.05.4 Remote Code Execution via Book Cover
BookStack before 26.05.4 contains a remote code execution vulnerability in the portable ZIP import functionality that allows users with Import Content and Create Books permissions to upload a PHP polyglot file as a book cover. Attackers can bypass image exten…
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High 7.5
One User Avatar | User Profile Picture <= 2.5.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via wpua-file Parameter
The One User Avatar | User Profile Picture plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.5.4 via the wpua_action_process_option_update function. This is due to insufficient file type validation in wp…
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High 8.8
Workeera Remote Tech Job Board < 1.0.6 - Subscriber+ Arbitrary File Upload via Candidate Profile Mass Assignment
The Workeera WordPress plugin before 1.0.6 does not restrict which profile values a candidate may submit, nor validate the type of the file it subsequently writes into a publicly reachable directory, allowing users with a role as low as subscriber to upload a…
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High 8.8
Thinking Software Technology｜Efence - Arbitrary File Upload
EFence developed by Thinking Software Technology has an Arbitrary File Upload vulnerability. Authenticated remote attackers can upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.
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High 7.2
CAYIN Technology｜CAYIN CMS-WS/CMS-SE/SMP - Arbitrary File Upload
CAYIN CMS-WS, CMS-SE, and SMP series products developed by CAYIN Technology have an Arbitrary File Upload vulnerability. Privileged remote attackers can upload and execute web shells backdoors, thereby enabling arbitrary code execution on the server.
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High 7.2
Webkul QloApps improper file upload validation
Webkul QloApps does not perform proper validation on uploaded file extensions or MIME types before moving the file to a publicly accessible directory. A remote, authenticated attacker with administrative privileges could upload executable files and achieve re…
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High 8.8
CM Map Locations <= 2.1.8 - Authenticated (Subscriber+) Arbitrary File Upload via cmloc_route_image_upload AJAX Action
The CM Map Locations – Visualize and share your locations in a few clicks plugin for WordPress is vulnerable to Limited Arbitrary File Upload in all versions up to, and including, 2.1.8 via the uploadMedia function. This is due to insufficient file type valid…
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High 8.8
Adminer before 5.4.3 Unrestricted File Upload via AdminerFileUpload
Adminer versions before 5.4.3 contain an unrestricted file upload vulnerability in the AdminerFileUpload plugin that allows authenticated users to upload PHP files by exploiting a permissive default extension allowlist. Attackers can upload PHP webshells to c…
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High 7.3
itsourcecode Online Pharmacy System User Registration register.php move_uploaded_file unrestricted upload
A flaw has been found in itsourcecode Online Pharmacy System 1.0. This affects the function move_uploaded_file of the file all_users/register.php of the component User Registration. Executing a manipulation of the argument photo can lead to unrestricted uploa…
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High 7.3
itsourcecode Payroll System admin_class.php save_settings unrestricted upload
A vulnerability was found in itsourcecode Payroll System 1.0. This affects the function save_settings of the file admin_class.php. The manipulation of the argument img results in unrestricted upload. The attack may be performed from remote. The exploit has be…
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High —
NocoBase: Arbitrary File Write chained with Local file Inclusion leads to Remote code execution
## Executive Summary Two vulnerabilities were identified and chained to achieve authenticated remote code execution The first vulnerability allows any authenticated admin to redirect the file upload storage root to an arbitrary path on disk including the appl…
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High 8.7
Remote Code Execution via Unrestricted File Upload in ATutor
ATutor Gameme module allows users to upload files of any type and extension without restriction. Due to improper handling of file uploads, files are stored in a web-accessible location before their content is validated. An authenticated attacker who knows a v…
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High 7.2
Frauscher Sensortechnik: FDS102 for FAdC/FAdCi R2 is vulnerable to Remote Code Execution via malicious configuration file.
A high privileged remote attacker can upload a .php file and then request it directly from /uploads/<filename>.php to achieve arbitrary code execution due to improper file type validation which could result in full system compromise.
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High 7.2
Depicter < 4.8.0 - Editor+ Arbitrary File Upload via ZIP Import
The Depicter — Popup & Slider Builder WordPress plugin before 4.8.0 does not validate the type of a file uploaded through its import feature and does not remove a malformed upload, allowing users with editor-level access to write an arbitrary file (including …
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High 8.7
Wekan: File Upload MIME Type Validation Bypass — Stored XSS via Missing System Binary Fallback
Wekan is open source kanban built with Meteor. Prior to 9.90, isFileValid() in models/fileValidation.js used the Unix file command for content-based MIME detection, but detectMimeFromFile() silently returned undefined when that binary was unavailable and the …
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High 8.9CVE-2026-73373 Public exploit
Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0.0-6.1.2
Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0.0-6.1.2 - The default list of dangerous files did not include SHTML files. On servers that executed these files, that could lead to code execution.
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High 8.8
WordPress is vulnerable to a remote code execution vulnerability via malicious Postscript file upload by an Author leve…
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High 7.2
Path traversal via unsanitized upload filename leads to arbitrary file write in Progress ShareFile Storage Zones Controller
In Progress ShareFile Storage Zones Controller v5.12.5 and below, a party with valid zone credentials can perform path traversal using resumable upload initiation endpoint, allowing the party to write arbitrary content to any location writable by the applicat…
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High 8.8
2100 Technology｜Official Document Management System - Arbitrary File Upload
Official Document Management System developed by 2100 Technology has an Arbitrary File Upload vulnerability, allowing authenticated remote attackers to upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.
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High 8.8
File Upload vulnerability in T-Systems International GmbH ImageMaster Version: 9.14.2.8.1 allows a remote attacker to e…
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High 8.8
Query Wrangler <= 1.5.57 - Authenticated (Subscriber+) Remote Code Execution via 'options' Parameter
The Query Wrangler plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.5.57 via the 'options' parameter parameter. This is due to missing capability check and nonce verification on the wp_ajax_qw_form_ajax handl…
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High 8.7
Unbounded DAA Decompression in Pandora Allows Denial of Service via Decompression Bomb
Pandora contains a denial-of-service vulnerability in its handling of DAA (Direct Access Archive) files. When extracting the internal ISO image from a DAA archive, compressed chunks were decompressed using zlib.decompress() without enforcing a limit on the re…
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High 8.8
Templately <= 3.7.1 - Authenticated (Contributor+) Arbitrary File Upload to Remote Code Execution via Gutenberg Cloud Import Attachment Filename Mismatch
The Templately – Elementor & Gutenberg Template Library: 6500+ Free & Pro Ready Templates And Cloud! plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 3.7.1 via the fetch_remote_file function. This is due to a f…
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High 8.8
MaxUpload <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter
The MaxUpload – Big File Uploads – Increase Maximum File Upload Size plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.4.0 via the handle_upload function. This is due to a filename-validation mismatch in the h…
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High 7.2
Dell Wyse Management Suite (WMS), versions prior to 2605.0.2, contain an Unrestricted Upload of File with Dangerous Typ…
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High 7.2
Dell Wyse Management Suite (WMS), versions prior to 2605.0.2, contain an Unrestricted Upload of File with Dangerous Typ…
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High 8.8
Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component
Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at `POST /server/php/submit.php` and stores them in a directory served by the same nginx and php-fpm instance. The allow-list that should restri…
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High 7.5
InstaWP Connect <= 0.1.3.6 - Unauthenticated Cryptographic Key Disclosure
The InstaWP Connect – 1-click WP Staging & Migration plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 0.1.3.6 via the (top-level script) function. This is due to the plugin stores its encrypted options file as …
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High 7.7
n8n before 1.123.67 Arbitrary File Write via Edit Image Node
n8n versions before 1.123.67, 2.31.5, and 2.32.1 contain an arbitrary file write vulnerability in the Edit Image node, which passes its output format parameter to the underlying image library without validation. An authenticated user able to run workflows can…
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High 8.8
Cockpit CMS Cockpit CMS - Unrestricted File Upload
An unrestricted file upload vulnerability in Cockpit CMS 2.6.0 allows authenticated users to upload files of any extension including PHP scripts via the asset upload endpoint. The allowed_uploads configuration defaults to wildcard (*) and uploaded files are s…
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High 8.8
Squeeze < 1.7.12 - Author+ Arbitrary File Upload
The Squeeze WordPress plugin before 1.7.12 does not validate the file type or extension of the per-size image data written by one of its attachment-update actions, allowing users with the upload_files capability (Author and above) to write an executable PHP f…
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High 7.3
Rongzhitong Visual Integrated Command and Dispatch Platform upload unrestricted upload
A vulnerability was detected in Rongzhitong Visual Integrated Command and Dispatch Platform up to 20260617. Impacted is an unknown function of the file /dm/dispatch/userinfo/upload. Performing a manipulation of the argument File results in unrestricted upload…
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High 7.2
wp-downloadmanager - Unrestricted File Upload via Missing Extension/MIME Validation and Path Traversal
The wp-downloadmanager WordPress plugin, in version 1.68.11 (also affecting the 6.9.4 release line), allows an admin-privileged user (current_user_can('manage_downloads')) to upload arbitrary files via download-add.php with no extension or MIME-type validatio…
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High 7.2
Pluck CMS - Unrestricted File Upload via Missing .php8 Extension in Upload Blacklist
Pluck CMS through 4.7.21 restricts dangerous file uploads in its admin file-management feature using a fixed blacklist in data/inc/files.php ('.php','php3','php4','php5','php6','php7','phtml','.phtm','.pht','.ph3','.ph4','.ph5','.asp','.cgi','.phar'), checked…
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High 8.8
LightSync Pro <= 2.1.6 - Authenticated (Author+) Arbitrary File Upload
The LightSync Pro plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the rest_replace_media() function in all versions up to, and including, 2.1.6. This makes it possible for authenticated attackers, with Autho…
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High 8.1
Zportals < 6.3.4 - Subscriber+ Arbitrary File Upload
The zportals WordPress plugin before 6.3.4 does not properly validate uploaded files, trusting the client-supplied content type and preserving the original file extension, allowing any authenticated user (Subscriber or higher) to upload arbitrary PHP files an…
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High 8.5
CVAT has stored XSS via annotation guide assets
CVAT is an open source interactive video and image annotation tool for computer vision. Versions 2.5.0 through 2.66.0 contain a XSS vulnerability that can be accessed through annotation guide assets. When CVAT serves the files attached to an annotation guide,…