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
3,429 results · Feed
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High 7.3
D-Link DNS-320 multi_uploadify.php unrestricted upload
A vulnerability has been found in D-Link DNS-320 1.0.2. Impacted is an unknown function of the file /web/jquery/uploader/multi_uploadify.php. The manipulation of the argument Filedata[] leads to unrestricted upload. Remote exploitation of the attack is possib…
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High 7.3
D-Link DNS-320 multi_uploadify.php unrestricted upload
A vulnerability was detected in D-Link DNS-320 1.0.2. This impacts an unknown function of the file /mydlink/multi_uploadify.php. Performing a manipulation of the argument Filedata[] results in unrestricted upload. The attack is possible to be carried out remo…
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High 7.3
D-Link DNS-320 save_ajax.php unrestricted upload
A security vulnerability has been detected in D-Link DNS-320 1.0.2. This affects an unknown function of the file /web/function/save_ajax.php. Such manipulation of the argument Malicious Handler leads to unrestricted upload. The attack can be executed remotely…
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High 7.3
D-Link DNS-320 uploadify.php unrestricted upload
A weakness has been identified in D-Link DNS-320 1.0.2. The impacted element is an unknown function of the file /web/jquery/uploader/uploadify.php. This manipulation of the argument https:/ucn9h68n9289.feishu.cn/wiki/JJcTwHz7aiKeq6kSItMcoeSUnMc?from=from_copy…
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High 7.3
D-Link DNS-320 uploadify.php unrestricted upload
A vulnerability was identified in D-Link DNS-320 1.0.2. Impacted is an unknown function of the file /photo_center/php/uploadify.php. The manipulation of the argument Malicious Handler leads to unrestricted upload. The attack may be initiated remotely. The exp…
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High 7.3
D-Link DNS-320 upload.php unrestricted upload
A vulnerability was determined in D-Link DNS-320 1.0.2. This issue affects some unknown processing of the file /web/web_file/upload.php. Executing a manipulation of the argument File can lead to unrestricted upload. The attack can be launched remotely. The ex…
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High 7.3
Metasoft 美特软件 MetaCRM upload.jsp unrestricted upload
A vulnerability was identified in Metasoft 美特软件 MetaCRM up to 6.4.0 Beta06. The impacted element is an unknown function of the file /business/qnaire/upload.jsp. Such manipulation of the argument File leads to unrestricted upload. The attack may be launched re…
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High 8.8
FreeScout Vulnerable to Authenticated Remote Code Execution via incomplete upload extension denylist (.pht) — bypass of CVE-2025-48471
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.224, the denylist that neutralizes dangerous file uploads (`Helper::$restricted_extensions`) is incomplete: it does not cover the `.pht` extension. The aut…
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Critical 10.0CVE-2026-61424 Public exploit
Joomla Extension - dj-extensions.com - Unauthenticated arbitrary file upload in DJ-Classifieds < 3.11.2
Joomla Extension - dj-extensions.com - Unauthenticated arbitrary file upload in DJ-Classifieds < 3.11.2 - The Joomla extension DJ-Classifieds is vulnerable to an unauthenticated file upload, leading to full RCE.
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Critical 10.0
Joomla Extension - dj-extensions.com - Unauthenticated arbitrary file upload in DJ-jDownloads < 4.1.6
Joomla Extension - jdownloads.com - Unauthenticated arbitrary file upload in jDownloads < 4.1.6 - The Joomla extension JDownloads is vulnerable to an unauthenticated file upload, leading to full RCE.
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Critical 9.4
Joomla Extension - themexpert.com - Authenticated arbitrary file upload in JMedia < 1.6.0
Joomla Extension - themexpert.com - Authenticated arbitrary file upload in JMedia < 1.6.0 - The Joomla extension JMedia is vulnerable to an authenticated arbitrary file upload, leading to RCE. Executable uploads/writes possible (incl. polyglot filenames); chm…
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High 8.6
HeyForm has unauthenticated /api/upload endpoint that accepts arbitrary files with no auth/session/form context
HeyForm is an open-source form builder. Prior to version 3.0.0-rc.9, `POST /api/upload` has no authentication guard, no global guard, no form-context validation, no `openToken` requirement, and no session cookie check. Any anonymous internet user can upload f…
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Medium 6.4
HeyForm Vulnerable to Stored XSS via Unauthenticated SVG File Upload
HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the `/api/upload` endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with `Content-Type: image/svg+xml` by E…
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Medium 5.3
Unrestricted Upload of File with Dangerous Type in Windu CMS
Windu CMS does not validate types of uploaded files. An authenticated attacker can upload arbitrary files, including PHP. This can lead to Remote Code Execution. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in v…
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Medium 4.7
SourceCodester Pizzafy Ecommerce System admin_class_novo.php save_settings unrestricted upload
A weakness has been identified in SourceCodester Pizzafy Ecommerce System 1.0. This affects the function save_settings of the file /admin/admin_class_novo.php. This manipulation of the argument img causes unrestricted upload. The attack is possible to be carr…
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Critical 9.8
CodeIgniter: Uploaded file extension validation bypass in `ext_in` rule
CodeIgniter is a PHP full-stack web framework. Prior to 4.7.3, the ext_in upload validation rule in system/Validation/StrictRules/FileRules.php checked the MIME-derived guessed extension instead of the client-provided filename extension. As a result, an uploa…
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High 8.8
Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content <= 4.16.18 - Authenticated (Author+) Limited Unsafe File Upload via upload_mimes Filter Expansion
The Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 4.16.18 via the allowed_mime_types func…
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Critical 9.8CVE-2026-36669 Public exploit
An unauthenticated arbitrary file upload vulnerability in ck_upload_handler.php in Feng Office 3.11.13.11 allows remote…
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Medium 6.5CVE-2026-12684 Public exploit
Customer Reviews for WooCommerce < 5.113.0 - Unauthenticated Arbitrary Media Upload via cr_upload_media
The Customer Reviews for WooCommerce WordPress plugin before 5.113.0 does not perform authentication, capability, or nonce checks on one of its media upload AJAX actions when the review media attachment feature is enabled, allowing unauthenticated users to up…
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High 7.1
DataEase: Remote Code Execution (RCE) via Zip Protocol & File Dropper
DataEase is an open source data visualization and analysis tool. Prior to 2.10.23, DataEase can be exploited by uploading payload.zip through the Excel upload API /datasource/upload, creating an H2 datasource that uses the zip: protocol, and executing an SQL …
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High 8.8
Grav before 1.0.3 Remote Code Execution via File Upload Extension Bypass
The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 contains a file upload extension bypass in the API media controller. HandlesMediaUploads::validateFileExtension() inspects only the final file extension via pathinfo($filename, PATHINFO_EXTENSION), so…
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Medium 5.3
Kali Forms < 2.4.17 - Unauthenticated Media Upload
The Kali Forms — Contact Form & Drag-and-Drop Builder WordPress plugin before 2.4.17 does not verify that a file upload is made against an existing form configured with a file-upload field, accepting uploads regardless of whether any such form exists, which a…
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Critical 9.9
FacturaScripts: Path traversal in UploadedFile::move() via getClientOriginalName() — arbitrary file write outside MyFiles/ leading to RCE
## Summary `FacturaScripts\Core\UploadedFile::move($destiny, $destinyName)` concatenates `$destiny` and `$destinyName` without normalizing the resulting path. Every caller in the codebase passes `UploadedFile::getClientOriginalName()` — the unsanitized client…
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Critical 9.3
Adobe Commerce | Unrestricted Upload of File with Dangerous Type (CWE-434)
Adobe Commerce is affected by an Unrestricted Upload of File with Dangerous Type vulnerability that could result in arbitrary code execution in the context of the current user, potentially gaining elevated access or control over the victim's account or sessio…
KEV Oct 27, 2026 -
High 7.3
code-projects Online Job Portal JobSeekerInsert.php unrestricted upload
A weakness has been identified in code-projects Online Job Portal 1.0. This affects an unknown function of the file /JobSeekerInsert.php. Executing a manipulation of the argument txtFile can lead to unrestricted upload. The attack can be executed remotely. Th…
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Critical 9.1
ChurchCRM: Authenticated Remote Code Execution (RCE) via Malicious Plugin Upload
ChurchCRM is an open-source church management system. Prior to version 7.4.0, an authenticated administrator can achieve Remote Code Execution (RCE) on the server by installing a malicious plugin ZIP archive containing a PHP webshell. The application explicit…
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Medium 5.3
Malicious webpage titles could allow overwriting of bundled PDF resources when saving webpages as PDFs in Firefox for iOS
Pages with malicious titles could potentially allow saved PDF content to overwrite PDF files or bundled content within the Firefox for iOS application sandbox. This vulnerability was fixed in Firefox for iOS 152.4.
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High 8.8
Laravel-Mediable < 7.0.0 File Upload RCE via Extension Bypass
Laravel-Mediable before 7.0.0 contains a file upload vulnerability that allows unauthenticated attackers to achieve remote code execution by uploading a file with an embedded PHP extension disguised within a double extension such as shell.php.jpg. The PATHINF…
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Critical 9.9
WordPress WoowBot Pro Max plugin <= 14.1.7 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in quantumcloud WoowBot Pro Max woowbot-pro-max allows Using Malicious Files.This issue affects WoowBot Pro Max: from n/a through <= 14.1.7.
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Critical 10.0
WordPress Aimogen Pro plugin <= 2.8.3 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in CodeRevolution Aimogen Pro aimogen-pro allows Using Malicious Files.This issue affects Aimogen Pro: from n/a through <= 2.8.3.
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Medium 4.7
SourceCodester Online Book Store System Book Image Upload Feature index.php books unrestricted upload
A security vulnerability has been detected in SourceCodester Online Book Store System 1.0. Impacted is an unknown function of the file /admin/index.php?page=books of the component Book Image Upload Feature. Such manipulation leads to unrestricted upload. The …
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Medium 5.3
Ragic｜Enterprise Cloud Database - Arbitrary File Upload
Enterprise Cloud Database developed by Ragic has a Arbitrary File Upload vulnerability, allowing unauthenticated remote attackers to upload malicious files and make them available for users to download.
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Medium 4.7
AREA 17 Twill CMS Media Library Insert FileLibraryController.php storeFile unrestricted upload
A vulnerability has been found in AREA 17 Twill CMS up to 3.6.0. The impacted element is the function FileLibraryController::storeFile of the file src/Http/Controllers/Admin/FileLibraryController.php of the component Media Library Insert Page. Such manipulati…
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High 7.3
hcr707305003 shiroiAdmin FileController.php upload unrestricted upload
A vulnerability was determined in hcr707305003 shiroiAdmin 1.1/1.3. Affected is the function FileController::upload of the file app/common/controller/FileController.php. Executing a manipulation of the argument File can lead to unrestricted upload. The attack…
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Low 2.1
Parse Server 9.0.0 Stored XSS via malformed Content-Type
Parse Server is affected by a stored cross-site scripting (XSS) vulnerability in versions >= 9.0.0, < 9.10.0-alpha.2 and <= 8.6.83. When an uploaded file's extension is not recognized by the mime package, Parse Server preserves the client-supplied Content-Typ…
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Critical 10.0
Joomla Extension - rsjoomla.com - Unauthenticated file upload in RSFiles component < 1.17.12
Joomla Extension - rsjoomla.com - Unauthenticated file upload in RSFiles component < 1.17.12 - The Joomla extension RSFiles is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
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Critical 9.0
Joomla Extension - phoca.cz - Authenticated file upload in Phoca Downloads component < 6.1.3
Joomla Extension - phoca.cz - Authenticated file upload in Phoca Downloads component < 6.1.3 - The Joomla extension Phoca Downloads is vulnerable to an authenticated arbitrary file upload that allows registered users uploading executable files and leads to fu…
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High 8.8
Swiss Toolkit For WP <= 1.4.6 - Authenticated (Author+) Arbitrary File Upload via upload_extension_files()
The Swiss Toolkit For WP plugin for WordPress is vulnerable to arbitrary file upload due to a flawed file type validation bypass in the `upload_extension_files()` function in all versions up to, and including, 1.4.6. The `upload_extension_files()` function ho…
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High 8.8
NotrinosERP: Authenticated arbitrary file upload leads to remote code execution via HRM employee "Documents" (doc_file)
#### Summary An authenticated user with the HR "Manage Employees" permission (`SA_EMPLOYEE`) can upload a file with an arbitrary extension through the employee **Documents** tab. The handler writes the raw client-supplied filename — extension intact — into a …
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Critical 9.8CVE-2026-15282 Public exploit
Instant Appointment <= 1.2 - Unauthenticated Arbitrary File Upload
The Instant Appointment plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'insapp_upload_image_as_attachment' function in all versions up to, and including, 1.2. This makes it possible for unauthenticated …