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
1,210 results · Clear filters · Feed
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High 8.8
e107 CMS 2.3.0 Authenticated Remote Code Execution via Theme Upload
e107 CMS 2.3.0 contains a remote code execution vulnerability that allows authenticated users with theme installation permissions to execute arbitrary commands by uploading malicious theme files. Attackers can upload a crafted theme package through the theme.…
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High 8.8
Slider Revolution 7.0.0 - 7.0.10 - Authenticated (Subscriber+) Arbitrary File Upload via _get_media_url
The Slider Revolution plugin for WordPress is vulnerable to Arbitrary File Upload in versions 7.0.0 to 7.0.10 via the '_get_media_url' and '_check_file_path' function. This is due to insufficient file type validation. This makes it possible for authenticated …
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High 8.6
CI4MS: Unrestricted PHP File Upload via Theme Installation Leads to Authenticated Remote Code Execution
CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. From version 0.26.0.0 to before version 0.31.7.0, a theme upload feature allows any authenticated backend user with t…
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High 8.8
Vvveb < 1.0.8.2 RCE via Media Upload Handler
Vvveb before version 1.0.8.2 contains an unrestricted file upload vulnerability in the media upload handler that allows authenticated users with media-upload permissions to bypass extension restrictions by uploading a .htaccess file to map .phtml extensions t…
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High 8.8
Betheme <= 28.4 - Authenticated (Author+) Arbitrary File Upload to Remote Code Execution via Icon Pack Upload
The Betheme theme for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 28.4. This is due to the upload_icons() function workflow moving and unzipping user-controlled ZIP files into a public uploads directory without validatin…
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High 7.1
livewire-markdown-editor has arbitrary file upload that allows stored XSS via attachment handler
### Impact All versions of `mckenziearts/livewire-markdown-editor` prior to **v1.3** contain a critical arbitrary file upload vulnerability in the `MarkdownEditor::updatedAttachments()` Livewire handler. The handler calls `$file->store()` with no server-side …
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High 7.3
funadmin Frontend Chunked Upload Endpoint UploadService.php chunkUpload unrestricted upload
A flaw has been found in funadmin up to 7.1.0-rc6. This affects the function UploadService::chunkUpload of the file app/common/service/UploadService.php of the component Frontend Chunked Upload Endpoint. This manipulation of the argument File causes unrestric…
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High 7.2CVE-2026-38751 Public exploit
OpenSTAManager contains an arbitrary file upload vulnerability in its module update functionality
OpenSTAManager version 2.10 and earlier contains an arbitrary file upload vulnerability in the module update functionality (modules/aggiornamenti/upload_modules.php)
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High 7.3
MindsDB Engine proc_wrapper.py exec unrestricted upload
A weakness has been identified in MindsDB up to 26.01. This impacts the function exec of the file mindsdb/integrations/handlers/byom_handler/proc_wrapper.py of the component Engine Handler. Executing a manipulation can lead to unrestricted upload. The attack …
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High 7.2
Sunnet｜CTMS and CPAS - Arbitrary File Upload
CTMS and CPAS developed by Sunnet has an Arbitrary File Upload vulnerability, allowing privileged remote attackers to upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.
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High 8.8
Cockpit Vulnerable to Unrestricted Upload of File with Dangerous Type
Cockpit 2.13.5 and earlier is affected by a misconfiguration within the Bucket component _isFileTypeAllowed function where a specially crafted filename bypasses an extension filter. This allows an authenticated attacker to rename arbitrary files with the .php…
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High 8.1
Drag and Drop File Upload for Contact Form 7 <= 1.1.3 - Unauthenticated Arbitrary File Upload via sanitize_file_name Bypass
The Drag and Drop File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.1.3. This is due to the plugin extracting the file extension before sanitization occurs and allowing the file type…
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High 7.1
Flowise: File Upload Validation Bypass in createAttachment
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, the Chatflow configuration file upload settings can be modified to allow the application/javascript MIME type. This lets an attacker upload .js files even…
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High 7.2CVE-2026-37748 Public exploit
Visitor Management System 1.0 by sanjay1313 is vulnerable to Unrestricted File Upload in vms/php/admin_user_insert.php …
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High 8.8
Vvveb CMS 1.0.8.2 Remote Code Execution via Media Upload
Vvveb CMS 1.0.8.2 contains a remote code execution vulnerability in its media upload handler that allows authenticated attackers to execute arbitrary operating system commands by uploading a PHP webshell with a .phtml extension. Attackers can bypass the exten…
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High 8.7
OpenMage LTS has Customer File Upload Extension Blocklist Bypass that Leads to Remote Code Execution
Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to version 20.17.0, the product custom option file uploa…
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High 7.3
rickxy Hospital Management System his_admin_account.php unrestricted upload
A vulnerability was found in rickxy Hospital Management System up to 88a4290d957dc5bdde8a56e5ad451ad14f7f90f4. Affected is an unknown function of the file /backend/admin/his_admin_account.php. The manipulation of the argument ad_dpic results in unrestricted u…
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High 7.3
langflow-ai langflow API Endpoint endpoints.py create_upload_file unrestricted upload
A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_file of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted uploa…
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High 8.8
CMP – Coming Soon & Maintenance Plugin by NiteoThemes <= 4.1.16 - Missing Authorization to Authenticated (Administrator+) Arbitrary File Upload and Remote Code Execution
The CMP – Coming Soon & Maintenance Plugin by NiteoThemes plugin for WordPress is vulnerable to arbitrary file upload and remote code execution in all versions up to, and including, 4.1.16 via the `cmp_theme_update_install` AJAX action. This is due to the fun…
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High 8.9CVE-2026-40487 Public exploit
Postiz Has Unrestricted File Upload via MIME Type Spoofing that Leads to Stored XSS
Postiz is an AI social media scheduling tool. Prior to version 2.21.6, a file upload validation bypass allows any authenticated user to upload arbitrary HTML, SVG, or other executable file types to the server by spoofing the `Content-Type` header. The uploade…
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High 8.1
Drag and Drop Multiple File Upload for Contact Form 7 <= 1.3.9.7 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist Bypass
The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.7. This is due to insufficient file type validation that occurs when custom blacklist types are confi…
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High 8.7
Note Mark has Stored XSS via Unrestricted Asset Upload
Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the asset delivery handler serves uploaded files inline and relies on magic-byte detection for content type, which does not identify text-based formats such as HTML, SVG, or XH…
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High 8.1
Weblate: Remote code execution during backup restoration
Weblate is a web based localization tool. In versions prior to 5.17, the project backup didn't filter Git and Mercurial configuration files which could lead to remote code execution under certain circumstances. This issue has been fixed in version 5.17. If de…
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High 8.8
Pachno 1.0.6 Unrestricted File Upload Remote Code Execution
Pachno 1.0.6 contains an unrestricted file upload vulnerability that allows authenticated users to upload arbitrary file types by bypassing ineffective extension filtering to the /uploadfile endpoint. Attackers can upload executable files .php5 scripts to web…
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High 8.6
Unrestricted File Upload in Extension Uploader leads to Remote Code Execution
Unrestricted Upload of File with Dangerous Type vulnerability allows Remote Code Execution via file upload. This issue affects Pandora FMS: from 777 through 800
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High 8.4
RGui 3.5.0 Local Buffer Overflow SEH DEP Bypass
RGui 3.5.0 contains a local buffer overflow vulnerability in the GUI preferences dialog that allows attackers to bypass DEP protections through structured exception handling exploitation. Attackers can craft malicious input in the Language for menus and messa…
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High 7.1
Chamilo LMS Affected by Authenticated Arbitrary File Write via BigUpload endpoint
Chamilo LMS is a learning management system. Prior to 1.11.38, any authenticated user (including students) can write arbitrary content to files on the server via the BigUpload endpoint. The key parameter controls the filename and the raw POST body becomes the…
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High 7.5
Chamilo LMS has Arbitrary File Upload via MIME-Only Validation in Exercise Sound Upload Leads to RCE
Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, an unrestricted file upload vulnerability in the exercise sound upload function allows an authenticated teacher to upload a PHP webshell by spoofing the Content-Type header to audio…
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High 7.2
Gerador de Certificados – DevApps <= 1.3.6 - Authenticated (Administrator+) Arbitrary File Upload
The Gerador de Certificados – DevApps plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the moveUploadedFile() function in all versions up to, and including, 1.3.6. This makes it possible for authenticated att…
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High 8.8
Brave CMS Sffected by Unrestricted File Upload via CKEditor Endpoint
Brave CMS is an open-source CMS. Prior to 2.0.6, an unrestricted file upload vulnerability exists in the CKEditor upload functionality. It is found in app/Http/Controllers/Dashboard/CkEditorController.php within the ckupload method. The method fails to valida…
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High 8.8
UniSharp Laravel File Manager v2.0.0-alpha7 Arbitrary File Upload
UniSharp Laravel File Manager v2.0.0-alpha7 and v2.0 contain an arbitrary file upload vulnerability that allows authenticated attackers to upload malicious files by sending multipart form data to the upload endpoint. Attackers can upload PHP files with the ty…
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High 7.3
Technostrobe HI-LED-WR120-G2 fs unrestricted upload
A weakness has been identified in Technostrobe HI-LED-WR120-G2 5.5.0.1R6.03.30. This impacts an unknown function of the file /fs. Executing a manipulation of the argument cwd can lead to unrestricted upload. The attack can be launched remotely. The exploit ha…
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High 8.8
An issue was discovered in Biztalk360 before 11.5. Because of incorrect access control, any user is able to request the…
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High 8.7
Hytale Modding Vulnerable to Remote Code Execution via File Upload Bypass in `FileController`
The Hytale Modding Wiki is a free service for Hytale mods to host their documentation & wikis. In version 1.2.0 and prior, the quickUpload() endpoint validates uploaded files by checking their MIME type (via PHP's finfo, which inspects file contents) but cons…
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High 7.3
Shandong Hoteam InforCenter PLM BaseHandler.ashx uploadFileToIIS unrestricted upload
A vulnerability was identified in Shandong Hoteam InforCenter PLM up to 8.3.8. The impacted element is the function uploadFileToIIS of the file /Base/BaseHandler.ashx. The manipulation of the argument File leads to unrestricted upload. It is possible to initi…
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High 8.7
baserCMS: unsafe File Upload Leading to Remote Code Execution (RCE)
baserCMS is a website development framework. Prior to version 5.2.3, the application's restore function allows users to upload a .zip file, which is then automatically extracted. A PHP file inside the archive is included using require_once without validating …
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High 7.3
PromtEngineer localGPT server.py do_POST unrestricted upload
A flaw has been found in PromtEngineer localGPT up to 4d41c7d1713b16b216d8e062e51a5dd88b20b054. The affected element is the function do_POST of the file backend/server.py. This manipulation causes unrestricted upload. The attack is possible to be carried out …
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High 8.7CVE-2026-25099 Public exploit
Remote Code Execution via Unrestricted File Upload in Bludit
Bludit’s API plugin allows an authenticated attacker with a valid API token to upload files of any type and extension without restriction, which can then be executed, leading to Remote Code Execution. This issue was fixed in 3.18.4.
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High 8.8
Sharp has Unrestricted File Upload via Client-Controlled Validation Rules
Sharp is a content management framework built for Laravel as a package. Versions prior to 9.20.0 contain a vulnerability in the file upload endpoint that allows authenticated users to bypass all file type restrictions. The upload endpoint within the `ApiFormU…
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High 8.8
PhreeBooks ERP 5.2.3 Remote Code Execution via Image Manager
PhreeBooks ERP 5.2.3 contains a remote code execution vulnerability in the image manager that allows authenticated attackers to upload and execute arbitrary PHP files by bypassing file extension controls. Attackers can upload malicious PHP files through the i…