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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Medium 6.4
HCL BigFix Service Management is affected by multiple security vulnerabilities.
HCL BigFix Service Management is affected by an Unrestricted File Upload vulnerability due to improper file validation controls, which could allow an unauthenticated attacker to upload and execute malicious payloads, resulting in a complete server compromise.
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Critical 9.8CVE-2026-45140 Public exploit
Chamilo LMS CStudio upload flow allows unauthenticated remote code execution
Chamilo LMS is an open-source learning management system. Prior to 2.0.1, Chamilo LMS allows an unauthenticated remote attacker to execute arbitrary code on the server. The authoritative advisory does not identify the affected endpoint, component, input, or e…
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High 7.2
HortusFox-Web < 6.1 Remote Code Execution via Import/Export
HortusFox-Web prior to version 6.1 contains a remote code execution vulnerability that allows authenticated administrators to execute arbitrary OS commands as the web server user by abusing the Import/Export functionality. Attackers can leverage the Import/Ex…
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Critical 9.8CVE-2026-87796 Public exploit
Multi Uploader for Gravity Forms <= 1.1.9 - Unauthenticated Arbitrary File Upload via Chunked File Upload
The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.1.9 via the move_file function. This is due to insufficient file type validation during chunked upload handling. This make…
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High 8.1
Paid Downloads <= 3.15 - Unauthenticated Arbitrary File Upload via 'paiddownloads_update_file' Action
The Paid Downloads plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.15 via the admin_request_handler function. This is due to missing authorization and file type validation in the admin_request_handler functi…
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High 8.8
WP Import Export Lite < 3.9.33 - Authenticated Arbitrary File Upload via Remote Image Import
The WP Import Export Lite WordPress plugin before 3.9.33 does not validate the type, extension or content of files it retrieves from a user-supplied URL during import, allowing users granted its import permission to store arbitrary files, including executable…
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High 8.8
Contest Gallery <= 32.0.1 - Unauthenticated Arbitrary File Upload via 'baseUrlForFacebook' Parameter
The Contest Gallery – Upload & Vote Photos, Media, Sell with PayPal & Stripe plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Overwrite in all versions up to, and including, 32.0.1 due to insufficient file path validation in the 'baseUrlFo…
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Medium 4.7CVE-2026-92247 Public exploit
synaptikcms synaptik-cms Admin File Manager file-manager.php rename unrestricted upload
A security vulnerability has been detected in synaptikcms synaptik-cms up to 1.3.4.4. This affects the function rename of the file admin/file-manager.php of the component Admin File Manager. The manipulation leads to unrestricted upload. The attack can be ini…
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High 8.6
Dell Wyse Management Suite, versions prior to 2605.0.3.683, contain an Unrestricted Upload of File with Dangerous Type …
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High 8.6
Dell Wyse Management Suite, versions prior to 2605.0.3.683, contain an Unrestricted Upload of File with Dangerous Type …
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High 8.6
Dell Wyse Management Suite, versions prior to 2605.0.3.683, contain an Unrestricted Upload of File with Dangerous Type …
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Medium 6.3
WuzhiCMS Avatar Upload index.php setAvatar unrestricted upload
A security flaw has been discovered in WuzhiCMS up to 4.1.0. This affects the function member::setAvatar of the file /index.php?m=member&f=user&v=setAvatar of the component Avatar Upload. The manipulation of the argument File results in unrestricted upload. T…
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Medium 6.3
SourceCodester Online Faculty Clearance System Profile Picture Upload edit_picture.php move_uploaded_file unrestricted upload
A vulnerability was found in SourceCodester Online Faculty Clearance System 1.0. This affects the function move_uploaded_file of the file production/edit_picture.php of the component Profile Picture Upload. Performing a manipulation of the argument File resul…
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Medium 6.3
SourceCodester College Notes Gallery Management System Profile Upload userprofile.php unrestricted upload
A vulnerability was detected in SourceCodester College Notes Gallery Management System 1.0. Affected is an unknown function of the file /dashboard/userprofile.php of the component Profile Upload. Performing a manipulation of the argument image results in unre…
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Critical 9.1
Anyquery: Arbitrary File Write (AFW) which could lead to Remote Code Execution (RCE) via Unrestricted ATTACH DATABASE in Server Mode
Anyquery is an SQL query engine built on top of SQLite. Prior to 0.4.5, anyquery server forwards unauthenticated SQL from its MySQL-compatible server port to SQLite without restricting ATTACH DATABASE filesystem targets. A remote attacker can select any path …
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Medium 6.6
backpack/crud: HasUploadFields keeps the attacker-supplied file extension — public-disk uploads of `shell.php` reach the webserver
backpack/crud provides Create, Read, Update & Delete (CRUD) functions for Backpack, a collection of Laravel packages that help users build custom administration panels. From 6.0.0 until 6.8.14 and 7.0.38, HasUploadFields methods uploadFileToDisk and uploadMul…
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Medium 5.3
DotVVM: Unrestricted file upload
DotVVM is an open source MVVM framework for web applications. Prior to 4.2.11, 4.3.15, and 5.0.0-preview09-final, applications with configured file upload storage allow unauthenticated users to submit files directly to DotvvmFileUploadMiddleware without an X-…
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High 7.5
Flask-Reuploaded: Extension-denylist bypass via case-folding asymmetry in name-override path (incomplete-fix variant of CVE-2026-27641)
Flask-Reuploaded provides file uploads for Flask. From 1.5.0 until 1.6.0, UploadSet.save(storage, name=...) in src/flask_uploads/flask_uploads.py applies lowercase_ext to the default upload path but uses the case-preserving extension helper for a caller-suppl…
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High 7.6
EasyAdmin: Stored Cross-Site Scripting (XSS) via uploaded files served inline in FileField and ImageField
EasyAdmin is a fast and modern admin generator for Symfony applications. From 5.0.0 until 5.0.13, FileField and ImageField can accept browser-executable uploads while templates/crud/field/file.html.twig links to stored files for inline same-origin rendering w…
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High 7.2
Unrestricted upload of file with dangerous type issue exists in Contec CAN 2.0B Communication Wireless LAN / USB Conver…
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High 8.8
Unrestricted upload of file with dangerous type issue exists in CONPROSYS TM Series. If a specially crafted file is upl…
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Medium 6.6
HotelDruid before 3.0.6 has insufficient file upload sanitation in the backup/restore function.
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High 7.3
Anil-matcha Open-Generative-AI S3 Upload upload-binary unrestricted upload
A vulnerability was identified in Anil-matcha Open-Generative-AI up to 1.0.11/2.0.0. Affected by this issue is some unknown functionality of the file /api/upload-binary of the component S3 Upload. Such manipulation of the argument x-proxy-target-url leads to …
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Medium 6.3
PHPGurukul Bank Locker Management System add-locker-form.php unrestricted upload
A weakness has been identified in PHPGurukul Bank Locker Management System 1.0. Affected is an unknown function of the file /blms/banker/add-locker-form.php. This manipulation of the argument addressproof causes unrestricted upload. Remote exploitation of the…
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Medium 6.3
lenve vhr Avatar Upload userface FastDFSUtils.upload unrestricted upload
A weakness has been identified in lenve vhr 1.0-SNAPSHOT. This vulnerability affects the function FastDFSUtils.upload of the file /hr/userface of the component Avatar Upload. This manipulation of the argument File causes unrestricted upload. The attack is pos…
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Critical 9.8
WP Images Upload on Piclect <= 1.0 - Unauthenticated Arbitrary File Upload
The WP images upload on piclect WordPress plugin through 1.0 does not validate the name or type of uploaded files before writing them to a publicly accessible directory, allowing unauthenticated attackers to upload arbitrary files and execute arbitrary code o…
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Critical 9.8
DS Ad Rotator <= 0.8 - Unauthenticated Arbitrary File Upload
The DS Ad Rotator WordPress plugin through 0.8 does not perform any capability check, nonce verification, or file-type validation on its image upload handler, allowing unauthenticated attackers to upload arbitrary files, including PHP, to a web-accessible dir…
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High 7.2
Gpx2Graphics <= 0.3 - Arbitrary File Upload via CSRF
The Gpx2Graphics WordPress plugin through 0.3 does not perform a CSRF check when handling file uploads, nor validate the type of the uploaded file, allowing attackers to make a logged-in administrator upload arbitrary files such as PHP via a CSRF attack, lead…
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Critical 9.8
MIPL Grouped Checkout Fields for WooCommerce <= 1.2.2 - Unauthenticated Arbitrary File Upload
The MIPL Grouped Checkout Fields for WooCommerce – Customize & Organize Checkout Fields. plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the `mipl_wc_upload_file` function in all versions up to, and includin…
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Medium 5.3
OTP Login & Register Woocommerce <= 2.7.2 - Unauthenticated Authentication Bypass via Brute Force
The OTP Login & Register Woocommerce plugin for WordPress is vulnerable to Authentication Bypass via OTP Brute Force in all versions up to, and including, 2.7.2. The vulnerability exists because the OTP rate-limit attempt counter in `process_otp_form` is keye…
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Medium 6.5
BurgerEditor 3.2.0 through 3.4.0 contains an issue with unrestricted upload of file with dangerous type. If this vulner…
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Critical 9.8CVE-2026-18351 Public exploit
Drag and Drop File Upload for Elementor Forms <= 1.6.0 - Unauthenticated Arbitrary File Upload via 'type' Parameter
The Drag and Drop File Upload for Elementor Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.6.0 via the elementor_file_upload function. This is due to insufficient file type validation in the is_file_t…
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Medium 5.4
MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page
MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory,…
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High 7.2
Rara One Click Demo Import < 1.3.5 Arbitrary File Upload RCE
Rara One Click Demo Import plugin for WordPress before 1.3.5 contains an arbitrary file upload vulnerability that allows authenticated attackers with Administrator privileges to upload arbitrary PHP files by passing a false value to wp_handle_upload() that di…
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Critical 9.8
An arbitrary file upload and path traversal vulnerability exists in LZ-litchi 1.0.0. Unauthenticated remote attackers c…
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Medium 5.5
InstantCMS has Remote Code Execution in package installer
InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Remote Code Execution (RCE) issue that allows remote authenticated attackers to execute any PHP code via the component installer. It is possible to upload a malici…
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High 7.3
aircheng-org iWebShop-5 pic.php uploadFile unrestricted upload
A security flaw has been discovered in aircheng-org iWebShop-5 up to 5.15. Impacted is the function upload_json/uploadFile of the file controllers/pic.php. The manipulation results in unrestricted upload. The attack can be executed remotely. The exploit has b…
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Critical 9.0
A vulnerability has been identified in Siveillance Control Pro V3.0 (All versions < V3.0.12.2173), Siveillance Control …
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High 7.3
light0011 cms Upload.class.php upload unrestricted upload
A security flaw has been discovered in light0011 cms c774dce31c6df0055568a8d5c53d964d99be199d/f72cf46f601efb2a0618c3814cc2f61380b38930. Affected by this issue is the function Upload::upload of the file ThinkPHP/Library/Think/Upload.class.php. Performing a man…
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High 7.3
Beijing Meite Software Technology U+Smart Enjoyment WebSite UploadFormImg.ashx unrestricted upload
A vulnerability was determined in Beijing Meite Software Technology U+Smart Enjoyment WebSite 18.6001.1096.1000. This impacts an unknown function of the file /Report/Upload/UploadFormImg.ashx. Executing a manipulation of the argument File can lead to unrestri…