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
3,428 results · Feed
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Critical 9.1
Super Forms <= 6.3.316 - Unauthenticated Arbitrary Directory Deletion via 'data[...][files][][subdir]' Parameter
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Arbitrary Directory Deletion in all versions up to, and including, 6.3.316 via the submit_form function. This is due to insufficient validation of attacker-controlled JSON field …
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High 8.8
Super Forms <= 6.3.316 - Authenticated (Subscriber+) Arbitrary File Upload via 'extensions' Form Element Attribute
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Unrestricted File Type Upload in all versions up to, and including, 6.3.316 via the upload_files function. This is due to missing file type validation in the upload_files functio…
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High 7.5
Unrestricted Upload of File with Dangerous Type in BugTracker.NET
Unrestricted file upload vulnerability in the BugTracker.NET attachment functionality. An authenticated user with administrator privileges could modify the application configuration to store files in a directory accessible via the web interface. Due to the la…
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High 8.6
Payload: Uploaded XML files could execute same-origin JavaScript
Payload is a free and open source headless content management system. In versions before 3.90.0 and canary versions before 4.0.0-canary.34, local upload configurations that accept XML files can store an XML file and stylesheet that execute JavaScript in the P…
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High 8.7
Payload: Bypassed sanitization of user uploaded SVGs
Payload is a free and open source headless content management system. In versions before 3.90.0 and canary versions before 4.0.0-canary.34, a collection that allows downloadable SVG uploads can store a malicious SVG that bypasses sanitization and executes att…
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High 7.2
HortusFox < 6.2 Remote Code Execution via Theme Import
HortusFox before 6.2 contains a remote code execution vulnerability in ThemeModule::startImport() where an uploaded ZIP archive is extracted directly into the public web root before any validation of file names, extensions, or content is performed. An authent…
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Critical 10.0
WordPress Doctreat theme <= 1.7.0 - Arbitrary File Upload vulnerability
Unauthenticated Arbitrary File Upload in Doctreat <= 1.7.0 versions.
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Critical 9.9
WordPress Workreap Core plugin <= 3.4.5 - Arbitrary File Upload vulnerability
Employer / Sales Representative Arbitrary File Upload in Workreap Core <= 3.4.5 versions.
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Critical 9.9
WordPress Taskbot plugin <= 6.6 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in Taskbot <= 6.6 versions.
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Critical 9.9
WordPress WP Duplicate plugin <= 1.1.11 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in WP Duplicate <= 1.1.11 versions.
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Critical 10.0
WordPress Kognetiks Chatbot for WordPress plugin <= 2.4.9 - Arbitrary File Upload vulnerability
Unauthenticated Arbitrary File Upload in Kognetiks Chatbot for WordPress <= 2.4.9 versions.
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High 8.8
ACPT (Premium) <= 2.0.66 - Authenticated (Subscriber+) Remote Code Execution via REST API Email Template
The ACPT (Premium) plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 2.0.66 via the render function. This is due to missing capability check on the REST API form creation endpoint and unsandboxed Twig environmen…
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High 7.5
CVE-2026-82988
There exists an arbitrary file download in vCast APK delivery mechanism in ViewSonic ViewBoard unknown allows a remote, unauthenticated attacker to trigger unprivileged APK installation via serving a malicious APK URL through an unauthenticated download endpo…
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Medium 6.3
feelec-yishu feelcrm-os UploadTicketFile Endpoint UploadController.class.php unrestricted upload
A security vulnerability has been detected in feelec-yishu feelcrm-os 1.0.0. This issue affects some unknown processing of the file App/Feelcrm/Crm/Controller/UploadController.class.php of the component UploadTicketFile Endpoint. Such manipulation of the argu…
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High 7.3
Ghost: Stored XSS via File Uploads on Local Storage
Ghost is a Node.js content management system. From 6.22.1 until 6.64.0, Ghost restricted the content type used to serve uploaded files to prevent browsers from executing them. On sites using the default local storage adapter, this restriction was not applied,…
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High 7.3
Ghost: Stored XSS via Bookmark Card Images
Ghost is a Node.js content management system. From 5.94.0 until 6.64.0, when creating a bookmark card, Ghost could store non-image files fetched from an external website as bookmark icons or thumbnails. This allowed any staff user, including Contributors, to …
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High 7.3
Ghost: Stored XSS via SVG Uploads Bypassing Sanitization
Ghost is a Node.js content management system. From 4.22.0 until 6.65.0, SVG media thumbnails and SVG images uploaded with a non-SVG file extension were stored without sanitization. This allowed any staff user, including Contributors, to host scripts on the si…
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Medium 6.8
Ghost: Stored XSS via SVG Files in Content Imports
Ghost is a Node.js content management system. From 4.0.0 until 6.67.0, SVG images included in content imports were stored without sanitization. An attacker who convinced an Administrator to import a crafted file could host scripts on the site's domain, possib…
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High 8.7
Plane: Stored XSS via SVG attachment served inline on the application origin (account takeover)
Plane is an open-source project management tool. Prior to 1.4.0, an authenticated low-privilege workspace member, including a Guest, can upload an image/svg+xml file as a generic or issue attachment. The file retains the attacker-controlled Content-Type, and …
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High 7.2
Kunstmaan CMS: MediaBundle extension blacklist bypass allows authenticated administrators to upload executable PHP files leading to remote code execution
Kunstmaan CMS is an open source content management system based on the Symfony framework. Prior to 7.3.2, src/Kunstmaan/MediaBundle/Helper/File/FileHandler.php performs the blacklisted_extensions check case-sensitively in FileHandler::getFilePath and lowercas…
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High 8.4
Mitel MiVoice Office 400 Music on Hold WAV File Upload Code Execution
DigitalCanion SA has discovered a vulnerability that allows remote attackers to execute arbitrary code on affected installations of the product. Authentication may be required to exploit this vulnerability. The specific flaw exists within the Configuration → …
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High 8.5
Mitel MiVoice Office 400 Backup Restoration Arbitrary File Write Leading to Root Code Execution
DigitalCanion has discovered a vulnerability in the backup restoration functionality that allows an attacker with access to the configured backup repository to introduce arbitrary files into the system during restoration. The specific flaw exists within the b…
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High 8.8
W (wcms) through 3.18.0 RCE and Arbitrary File Write via Media Upload API
W (vincent-peugnet/wcms) through 3.18.0 contains a remote code execution vulnerability that allows authenticated editors to write arbitrary files by abusing the unvalidated path in POST /api/v0/media/upload/[*:path]. Attackers can upload .php files executed b…
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Critical 9.8
H3C CVM Unauthenticated File Upload via fileUpload/upload Token
H3C CVM, the Cloud Virtualization Management component of the H3C CAS cloud platform, contains an unauthenticated arbitrary file upload vulnerability in the /cas/fileUpload/upload endpoint that allows remote attackers to write arbitrary files by manipulating …
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High 7.3
onetwothreeneth HospitalManagementSystem controller.php edit_patient unrestricted upload
A weakness has been identified in onetwothreeneth HospitalManagementSystem up to 9ef91ed6007314b6473110ed699dff76d158f61d. The affected element is the function add_patient/add_physician/add_account/update_account/update_subaccount/edit_physician/edit_patient …
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High 7.2
YesWiki before 4.6.7 Unrestricted File Upload via Bazar CSV Import
YesWiki before 4.6.7 contains an unrestricted file upload vulnerability that allows authenticated admins to write remote files into the web-accessible files/ directory via Bazar CSV import preview. Attackers can import a CSV whose file or image field referenc…
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High 7.3
Ghost 5.94.0 before 6.64.0 Stored XSS via Bookmark Card Images
Ghost from 5.94.0 before 6.64.0 contains a stored cross-site scripting vulnerability that allows staff users, including Contributors, to host arbitrary HTML by abusing bookmark card image fetching. Attackers can create bookmark cards that store non-image file…
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High 7.3
Ghost 6.22.1 before 6.64.0 Stored XSS via Local Storage File Uploads
Ghost from 6.22.1 before 6.64.0 contains a stored cross-site scripting vulnerability that allows staff users to host scripts by uploading files served with extension-derived content types on the default local storage adapter. Attackers can upload script-beari…
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High 8.1
Ninja Forms - File Uploads <= 3.3.34 - Unauthenticated Arbitrary File Upload
The Ninja Forms - File Uploads plugin for WordPress is vulnerable to arbitrary file operations in all versions up to, and including, 3.3.34 via the external (Amazon S3) upload flow. The plugin trusts an attacker-supplied file path from the form submission and…
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Critical 9.1
GetSimple CMS: CSRF, SSRF, and Unrestricted Zip Extraction
GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. Prior to version 1.5, the update handler in UpdateCE.php downloads a ZIP archive and extracts its contents into the web root without validating file…
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High 8.6
Unrestricted File Upload Leading to Remote Code Execution in Admin Tools File Manager
Incomplete extension blacklist in the File Manager module allows authenticated upload and execution of arbitrary .phar files. Affects Pandora FMS from 777 onwards.
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High 7.5
CSRF Bypass Leading to Remote Code Execution via Unrestricted File Upload in Plugin File Manager
A chained CSRF bypass and unrestricted file upload vulnerability in the Plugin File Manager allows an attacker to upload and execute arbitrary PHP code, resulting in Remote Code Execution. This issue affects Pandora FMS: from 777 onwards.
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Medium 6.3
formtools.org Form Tools Ajax actions.php uploadFile unrestricted upload
A vulnerability was detected in formtools.org Form Tools up to 3.1.1. This issue affects the function Files::uploadFile of the file global/code/actions.php of the component Ajax Handler. The manipulation results in unrestricted upload. It is possible to launc…
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Low 1.8
Genians, Inc Genian SSL PNS Unrestricted File Upload
An unrestricted file upload vulnerability caused by insufficient file extension and integrity verification in Genian SSL PNS allows an attacker to upload a dangerous file that is not an official patch
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High 7.2
Kiteworks Email Protection Gateway Remote Code Execution
Kiteworks Email Protection Gateway did not sufficiently validate the content of an uploaded backup, and allowed an administrator to influence how the application loaded it. An authenticated administrator could potentially use this to execute arbitrary code on…
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Medium 4.1
Kiteworks Core Unrestricted Upload of File with Dangerous Type
An authenticated administrator could bypass the content validation applied to an administrative file upload and store a file containing dangerous content on the appliance. This did not by itself result in code execution, which would require a separate vulnera…
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High 7.5
Kiteworks Email Protection Gateway Unrestricted Upload of File with Dangerous Type
An unauthenticated attacker could cause a file with attacker-controlled content to be written to the appliance filesystem through an administrative upload handler that did not properly authenticate the request. This did not by itself result in code execution,…
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High 8.8
yii2-starter-kit through 4.2.0 Unrestricted File Upload RCE
yii2-starter-kit through 4.2.0 fails to validate file types in the backend storage upload actions, allowing authenticated managers to upload PHP files. Attackers with manager role can upload PHP scripts to the web-accessible storage directory and request them…
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Critical 10.0CVE-2026-102427 Public exploit
Joomla Extension - ordasoft.com - Unauthenticated Remote Code Execution in OrdaSoft Joomla CCK < 8.3.16
Joomla Extension - ordasoft.com - Unauthenticated Remote Code Execution in OrdaSoft Joomla CCK < 8.3.16 - site/uploader.php is reached through the component’s normal frontend routing (task=getContent), a task with no authentication or ACL check anywhere in th…
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High 7.2
DigiWin｜EasyFlow .NET - Arbitrary File Upload
EasyFlow .NET developed by Digiwin has an Arbitrary File Upload vulnerability. Privileged remote attackers can upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.