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
3,427 results · Feed
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Critical 9.1
Docat has Arbitrary File Upload exists in Upload API
Docat is a tool for hosting versioned static documentation. In the affected implementation, an arbitrary file upload vulnerability in the `Upload API` arises because the API does not validate the `uploaded file path or type`. An attacker can overwrite sensiti…
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Critical 9.1
Virtual Folder Path Confinement Bypass in Progress WS_FTP Server
A path traversal vulnerability in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow a delegated Host Administrator to access locations outside their authorized scope, potentially enabling remote code execution.
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Critical 9.1
Host Administrator Path Containment Bypass in Progress WS_FTP Server
A path traversal vulnerability in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow a delegated Host Administrator to access or modify files outside their authorized scope.
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Critical 9.8
Chat AI with Dispatcher < 2.4 - Unauthenticated Arbitrary File Upload
The Chat AI with Dispatcher WordPress plugin before 2.4 does not properly validate uploaded files, relying only on a spoofable client-supplied content type, allowing unauthenticated attackers to upload arbitrary files, including PHP, which can lead to remote …
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Medium 4.8
Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin
In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived from the supplied filename. A user holding the EDIT_SYSTEM…
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High 8.6
HCL BigFix AEX is affected by multiple security vulnerabilities.
HCL BigFix AEX is affected by an Unrestricted File Upload and Improper Access Control vulnerability. This could allow an attacker to upload malicious or unauthorized files and directly access or download sensitive uploaded content, potentially leading to info…
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Critical 9.8
Contact Manager <= 9.1.2 - Unauthenticated Arbitrary File Upload via Trailing-Dot Filename Blacklist Bypass
The Contact Manager plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 9.1.2 via the add_message function. This is due to an incomplete extension blacklist that fails to detect dangerous extensions when a trailin…
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High 8.8CVE-2026-109384 Public exploit
The Innovative Form Builder <= 1.5.1 - Authenticated (Custom+) Arbitrary File Upload via 'allowedFileExtensions' Configuration + Public /form/submission/ Multipart Upload
The The Innovative Form Builder – IvyForms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.5.1 via the filterFiletypeAndExt function. This is due to insufficient file type validation due to the absence of a …
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Critical 9.8CVE-2026-103688 Public exploit
Checkout Files Upload for WooCommerce < 2.4.0 - Unauthenticated Arbitrary File Upload
The Checkout Files Upload for WooCommerce WordPress plugin before 2.4.0 does not validate uploaded file types when its accepted file types setting is left empty, which it documents as the way to accept all files, allowing unauthenticated users to upload arbit…
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High 7.5
affiliate-toolkit <= 3.9.2 - Authenticated (Contributor+) Arbitrary File Upload via 'atkp_product_largeimageurl' Parameter
The affiliate-toolkit – Multi-Network Affiliate & Amazon Product Display plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.9.2 via the upload_image function. This is due to insufficient file type validation in…
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Critical 9.8
Pie Register Premium <= 3.8.4.0 - Unauthenticated Arbitrary File Upload via piereg_file_upload AJAX Handler
The Pie Register Premium plugin for WordPress is vulnerable to Unrestricted File Type Upload in all versions up to, and including, 3.8.4.0 via the piereg_file_upload function. This is due to the plugin performing file type validation via wp_check_filetype and…
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High 7.2
Xerte Online Toolkits through 3.15.5 RCE via Language Pack Import
Xerte Online Toolkits through 3.15.5 contains a remote code execution vulnerability that allows authenticated users with system permission to run PHP by importing a crafted language pack. Attackers can upload a ZIP via import_language.php containing a .inc fi…
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High 8.8
C97net qEngine CMS through 6.0.0, Kemana Directory through 1.5.6, Cart Engine through 3.0.0 Unrestricted File Upload via Image Fields
C97net qEngine CMS through 6.0.0, Kemana Directory through 1.5.6, and Cart Engine through 3.0.0 contain an unrestricted file upload vulnerability in administrative image fields. Editor-role users can upload PHP scripts via the page_image or cat_image paramete…
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High 7.3
oretnom23 php-travel-agency-system employee_insert.php unrestricted upload
A vulnerability was found in oretnom23 php-travel-agency-system. This affects an unknown part of the file admin/employee_insert.php. Performing a manipulation of the argument employee photo results in unrestricted upload. The attack is possible to be carried …
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High 8.8
Unrestricted Upload of File in PuMuKIT application
Unrestricted Upload of File with Dangerous Type vulnerability in the PuMuKIT application allows a unauthenticated user to upload any type of file to the server, and to any path where the web server user has write permissions. This could also allow them to del…
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Medium 4.7
SourceCodester Online Food Ordering System add_food.php unrestricted upload
A flaw has been found in SourceCodester Online Food Ordering System 1.0. Impacted is an unknown function of the file admin/add_food.php. Executing a manipulation of the argument image can lead to unrestricted upload. The attack may be performed from remote. T…
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Critical 9.9
An unrestricted file upload vulnerability exists in the campaign import feature of Mautic 7. When processing an uploade…
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High 7.2
Oray Pugongying X5 Pro PPPoE WAN Setting upload_files plugin_init unrestricted upload
A vulnerability has been found in Oray Pugongying X5 Pro 7.6.1. Affected by this issue is the function plugin_init of the file /tmp/upload_files of the component PPPoE WAN Setting Handler. Such manipulation of the argument pppd_options leads to unrestricted u…
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Medium 6.3
GouGuOA Api.php chunkUpload unrestricted upload
A security flaw has been discovered in GouGuOA up to 6.1.2. The impacted element is the function chunkUpload of the file app/disk/controller/Api.php. The manipulation of the argument file_extension results in unrestricted upload. It is possible to launch the …
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Medium 6.3
KodCloud KodExplorer Online Editor Save Endpoint editor.class.php unrestricted upload
A vulnerability has been found in KodCloud KodExplorer up to 4.55. Affected by this vulnerability is an unknown functionality of the file app/controller/editor.class.php of the component Online Editor Save Endpoint. Such manipulation of the argument path/file…
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Medium 6.3
prasathmani TinyFileManager Remote URL File Upload tinyfilemanager.php unrestricted upload
A security vulnerability has been detected in prasathmani TinyFileManager up to 2.6. Affected by this issue is some unknown functionality of the file tinyfilemanager.php of the component Remote URL File Upload Module. The manipulation leads to unrestricted up…
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High 8.5
baserCMS: BcCustomContent file fields can be configured to allow executable file extensions such as php, leading to arbitrary PHP file upload
baserCMS is a website development framework. Starting in version 5.0.0-beta1 and prior to versions 5.3.2 and 5.4.2, `PermissionGroupsService::build()` reads a plugin's `config/permission.php` to decide what each user group may reach. When that file is absent …
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Medium 5.4
Depicter 4.0.5 - 4.8.1 - Editor+ Arbitrary File Upload via Media Upload
The Depicter — Popup & Slider Builder WordPress plugin before 4.8.2 does not properly validate uploaded files in its editor media-upload endpoint, checking only the client-supplied MIME type and a case-sensitive block of the .php extension, which allows users…
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Medium 5.4
Part-DB: SVG Sanitization Bypass via Extension Spoofing Leads to Stored XSS in Attachment Viewer
Part-DB is an open source inventory management system for electronic components. Prior to version 2.12.3, Part-DB-server sanitizes SVG files based solely on the user-controlled filename extension rather than actual file content type. An authenticated attacker…
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Critical 9.6
Part-DB: Authenticated RCE via .phar attachment upload served from public/media
Part-DB is an open source inventory management system for electronic components. Prior to version 2.12.1, the part attachment upload handler stores uploaded files under the web-served media directory using the client-supplied file extension, and its extension…
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Critical 10.0CVE-2026-102785 Public exploit
Joomla Extension - yootheme.com - Unauthenticated remote code execution in YOOtheme Pro 5.0.0-5.0.52
Joomla Extension - yootheme.com - Unauthenticated remote code execution in YOOtheme Pro 5.0.0-5.0.52 - YOOtheme Pro’s publicly accessible image transformation handler incompletely binds normalized image operations and the output destination to its request sig…
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High 7.3
file-management-system FileController.php store unrestricted upload
A vulnerability was determined in file-management-system dc9ce1bf27f94b23d906cb1e86ce374dc94ca5df. Impacted is the function store of the file app/Http/Controllers/FileController.php. This manipulation of the argument File causes unrestricted upload. The attac…
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High 7.3
oretnom23 file-management-system-php admin_class.php save_files unrestricted upload
A flaw has been found in oretnom23 file-management-system-php up to 2e3c1ebe60f121e8df4fb3f544f0e9591d9a01e4. This affects the function save_files of the file admin_class.php. Executing a manipulation of the argument Upload can lead to unrestricted upload. It…
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Critical 9.9
WordPress Mang Board WP plugin <= 2.4.4 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Kitae Park Mang Board WP mangboard allows Upload a Web Shell to a Web Server.This issue affects Mang Board WP: from n/a through 2.4.4.
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Critical 10.0
WordPress WP Mailster plugin <= 1.9.1.0 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in WP Mailster WP Mailster wp-mailster allows Upload a Web Shell to a Web Server.This issue affects WP Mailster: from n/a through 1.9.1.0.
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Medium 5.4
Trudesk through 1.2.11 Unrestricted File Upload via /settings/general/uploadlogo
Trudesk through 1.2.11 contains an unrestricted file upload vulnerability that allows any authenticated user to place HTML or SVG files in the public webroot via the uploadlogo, uploadpagelogo and uploadfavicon endpoints. Attackers can spoof an image MIME typ…
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Critical 9.8
HKUDS Vibe-Trading before 0.1.7 Missing Authentication in FastAPI Server Enabling RCE
HKUDS Vibe-Trading from 0.1.0 before 0.1.7 contains a missing authentication vulnerability that allows unauthenticated attackers to access the FastAPI surface because require_auth() returns early when API_AUTH_KEY is unset. Attackers can post messages to /ses…
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Medium 6.8
IBM Cyber Fraud includes components with multiple known vulnerabilities
IBM Cyber Fraud 1.0.0 through 1.0.2 could allow a remote authenticated attacker to execute arbitrary code due to unrestricted upload of a file with a dangerous type.
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Medium 6.3
DrayTek Vigor2960 commonupload mainfunction.cgi unrestricted upload
A vulnerability was determined in DrayTek Vigor2960 1.5.1.6 Revision 8218. This issue affects some unknown processing of the file /cgi-bin/mainfunction.cgi of the component commonupload. Executing a manipulation of the argument upload_path/upload_name can lea…
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Medium 6.3
arizu-id fast-tunnel Plugin Installer api_plugins.php extractTo unrestricted upload
A security vulnerability has been detected in arizu-id fast-tunnel 1.0.0. Affected by this issue is the function ZipArchive::extractTo of the file backend/api_plugins.php of the component Plugin Installer. Such manipulation of the argument plugin_file leads t…
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Critical 9.6
Eptura Archibus Workflow Rule Enables Unauthenticated Arbitrary File Upload Leading to Remote Code Execution
A user can upload export reports with any file contents and specify any contents. JSP code can be uploaded, JSPX can be specified as the file extension, and anyone can browse to the uploaded file, leading to command execution. The authentication bypass vulner…
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High 7.3
vraj404 Criminal-Management-System home.php move_uploaded_file unrestricted upload
A vulnerability was identified in vraj404 Criminal-Management-System up to 2808d057e7ddc5295519a487365b0cacfd0ba8c4. This impacts the function move_uploaded_file of the file home.php. The manipulation of the argument my_img leads to unrestricted upload. Remot…
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Critical 9.9
WordPress MapSVG plugin <= 8.16.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in PT Norther Lights Production MapSVG mapsvg-lite-interactive-vector-maps allows Upload a Web Shell to a Web Server.This issue affects MapSVG: from n/a through 8.16.1.
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High 8.8
DoubleScale | All-in-One CRM <= 1.5.1 - Authenticated (Subscriber+) Arbitrary File Upload via Portal 'ticketless' Attachment Endpoint
The DoubleScale | All-in-One CRM – Sales, Multi-Channel Marketing, Newsletter, Booking, Helpdesk, Automation, MCP & More plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.5.1 via the store_upload function. Thi…
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High 8.8
YaySMTP <= 2.7.7 - Authenticated (Subscriber+) Arbitrary File Upload via Attachment Filename Extension
The YaySMTP – WP Mail SMTP with Email Logs, Tracking & Reports plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.7.7 via the putFile function. This is due to insufficient file type validation in the putFile fu…