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 9.8
Thinking Software Technology｜EFence - Arbitrary File Upload
EFence developed by Thinking Software Technology has an Arbitrary File Upload vulnerability. Unauthenticated remote attackers can upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.
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High 7.2
CAYIN Technology｜CAYIN CMS-WS/CMS-SE/SMP - Arbitrary File Upload
CAYIN CMS-WS, CMS-SE, and SMP series products developed by CAYIN Technology have an Arbitrary File Upload vulnerability. Privileged remote attackers can upload and execute web shells backdoors, thereby enabling arbitrary code execution on the server.
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Critical 9.8
An arbitrary file upload vulnerability in the /v1/my_drive/batch_upload component of cohere North AI v1.1.5 allows atta…
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Medium 4.6
tamguo 1.5.3 is vulnerable to Unrestricted File Upload Leading to Stored XSS. The /uploadFile and /imgUpload endpoints …
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Critical 9.8
In DocSys-master V2.02.85, the uploadMarkdownPic interface in src/com/DocSystem/controller/DocController.java has an ar…
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Medium 6.5
ContiNew Admin through 4.1.0 Missing Authorization and File-Type Allowlist on Multipart Upload Endpoints
ContiNew Admin fails to apply file-upload permission checks or file-type allowlist validation to multipart upload endpoints, allowing authenticated users to store files with arbitrary extensions. Attackers can initialize chunked uploads, send file parts, and …
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Medium 5.3
Reachy Mini: Unrestricted Upload of File with Dangerous Type
Reachy Mini is an SDK for controlling Reachy Mini robots. Prior to 1.8.2, the Reachy Mini daemon exposes the /api/media/sounds/upload endpoint implemented by the upload_sound method in src/reachy_mini/daemon/app/routers/media.py without authentication, file-e…
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High 7.2
Webkul QloApps improper file upload validation
Webkul QloApps does not perform proper validation on uploaded file extensions or MIME types before moving the file to a publicly accessible directory. A remote, authenticated attacker with administrative privileges could upload executable files and achieve re…
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Critical 9.8
File Upload in TRTEK Software's Software Repository Management
Unrestricted upload of file with dangerous type vulnerability in TRtek Technological Products Computer Software Hardware Industry and Trade Limited Company Software Repository Management allows Upload a Web Shell to a Web Server. This issue affects Software R…
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Medium 4.8
Ech0 before 4.4.3 Stored XSS via SVG Upload
Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files cont…
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High 8.8
CM Map Locations <= 2.1.8 - Authenticated (Subscriber+) Arbitrary File Upload via cmloc_route_image_upload AJAX Action
The CM Map Locations – Visualize and share your locations in a few clicks plugin for WordPress is vulnerable to Limited Arbitrary File Upload in all versions up to, and including, 2.1.8 via the uploadMedia function. This is due to insufficient file type valid…
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High 8.8
Adminer before 5.4.3 Unrestricted File Upload via AdminerFileUpload
Adminer versions before 5.4.3 contain an unrestricted file upload vulnerability in the AdminerFileUpload plugin that allows authenticated users to upload PHP files by exploiting a permissive default extension allowlist. Attackers can upload PHP webshells to c…
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Critical 9.9
WordPress UltimateAI plugin <= 3.1.0 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in UltimateAI <= 3.1.0 versions.
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Medium 4.8
Unrestricted upload of file with dangerous type in Prospero Flow CRM allows stored cross-site scripting via SVG
Unrestricted Upload of File with Dangerous Type in the company logo upload in Roskus Prospero Flow CRM before 5.15.13 allows an authenticated user holding the create company and update company permissions to execute arbitrary JavaScript in the application ori…
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High 7.3
itsourcecode Online Pharmacy System User Registration register.php move_uploaded_file unrestricted upload
A flaw has been found in itsourcecode Online Pharmacy System 1.0. This affects the function move_uploaded_file of the file all_users/register.php of the component User Registration. Executing a manipulation of the argument photo can lead to unrestricted uploa…
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High 7.3
itsourcecode Payroll System admin_class.php save_settings unrestricted upload
A vulnerability was found in itsourcecode Payroll System 1.0. This affects the function save_settings of the file admin_class.php. The manipulation of the argument img results in unrestricted upload. The attack may be performed from remote. The exploit has be…
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Medium 6.1
CyberTutor｜NewSiteServer (NSS) - Arbitrary File Upload
NewSiteServer (NSS) developed by CyberTutor has an Arbitrary File Upload vulnerability. Unauthenticated remote attackers can upload arbitrary files, including malicious HTML files, thereby achieving effects similar to cross-site scripting.
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Critical 9.1
xShop: Unrestricted File Upload in File Attachment Module in Admin panel leads to Arbitrary Code Execution
xShop is an open-source shop developed in Laravel. An Unrestricted File Upload vulnerability in xShop version 3.0.3 allows an authenticated administrator to upload executable files (e.g., .php). By uploading a specially crafted php file, an attacker can achie…
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Medium 6.3
CodeAstro Online Job Portal update-profile.php unrestricted upload
A vulnerability was identified in CodeAstro Online Job Portal 1.0. Affected by this vulnerability is an unknown functionality of the file /users/update-profile.php. The manipulation of the argument Name leads to unrestricted upload. The attack can be initiate…
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High —
NocoBase: Arbitrary File Write chained with Local file Inclusion leads to Remote code execution
## Executive Summary Two vulnerabilities were identified and chained to achieve authenticated remote code execution The first vulnerability allows any authenticated admin to redirect the file upload storage root to an arbitrary path on disk including the appl…
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Critical 9.4
) Missing Server-Side File Extension Validation in vsDesk
An issue was discovered in vsDesk v14.0101. An authenticated attacker with administrative privileges can bypass client-side file validation in the "Import via CSV" component due to a lack of server-side validation. This allows the upload of an arbitrary file,…
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Medium 4.7
SourceCodester Simple Online Food Ordering System ajax.php save_menu unrestricted upload
A vulnerability was identified in SourceCodester Simple Online Food Ordering System 1.0. This issue affects some unknown processing of the file /admin/ajax.php?action=save_menu. The manipulation of the argument img leads to unrestricted upload. The attack is …
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High 8.7
Remote Code Execution via Unrestricted File Upload in ATutor
ATutor Gameme module allows users to upload files of any type and extension without restriction. Due to improper handling of file uploads, files are stored in a web-accessible location before their content is validated. An authenticated attacker who knows a v…
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Critical 9.9
WordPress Warehouse Cargo theme <= 2.6.9 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in Warehouse Cargo <= 2.6.9 versions.
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Critical 9.9
WordPress Smart Cleaning theme <= 4.8.6 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in Smart Cleaning <= 4.8.6 versions.
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Critical 9.9
WordPress IT Residence theme <= 3.2.1 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in IT Residence <= 3.2.1 versions.
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Critical 9.1
WordPress Media LIbrary Assistant plugin <= 3.39 - Arbitrary File Upload vulnerability
Author Arbitrary File Upload in Media LIbrary Assistant <= 3.39 versions.
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High 7.2
Frauscher Sensortechnik: FDS102 for FAdC/FAdCi R2 is vulnerable to Remote Code Execution via malicious configuration file.
A high privileged remote attacker can upload a .php file and then request it directly from /uploads/<filename>.php to achieve arbitrary code execution due to improper file type validation which could result in full system compromise.
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High 7.2
Depicter < 4.8.0 - Editor+ Arbitrary File Upload via ZIP Import
The Depicter — Popup & Slider Builder WordPress plugin before 4.8.0 does not validate the type of a file uploaded through its import feature and does not remove a malformed upload, allowing users with editor-level access to write an arbitrary file (including …
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Medium 6.3
DeDeCMS select_media_post.php unrestricted upload
A flaw has been found in DeDeCMS 3. Affected by this vulnerability is an unknown functionality of the file /include/dialog/select_media_post.php. Executing a manipulation of the argument uploadfile can lead to unrestricted upload. The attack can be executed r…
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High 8.7
Wekan: File Upload MIME Type Validation Bypass — Stored XSS via Missing System Binary Fallback
Wekan is open source kanban built with Meteor. Prior to 9.90, isFileValid() in models/fileValidation.js used the Unix file command for content-based MIME detection, but detectMimeFromFile() silently returned undefined when that binary was unavailable and the …
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Critical 9.0
WordPress Elementor Pro plugin <= 4.2.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Elementor Elementor Pro allows Using Malicious Files. This issue affects Elementor Pro: from n/a through 4.2.1.
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Critical 10.0
Joomla Extension - cmsjunkie.com - Arbitrary file upload / deletion (path traversal) in J-BusinessDirectory < 6.2.3
Joomla Extension - cmsjunkie.com - Arbitrary file upload / deletion (path traversal) in J-BusinessDirectory < 6.2.3 - Upload/remove accepted a client-controlled root (_path_type could point at the component site/admin trees), did not enforce path containment,…
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Critical 10.0
Joomla Extension - yootheme.com - Unauthenticated arbitrary file upload in Zoo < 4.1.64
Joomla Extension - yootheme.com - Unauthenticated arbitrary file upload in Zoo < 4.1.64 - The image element accepts arbitrary files when the client-supplied Content-Type falls within the image MIME group.
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High 8.9CVE-2026-73373 Public exploit
Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0.0-6.1.2
Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0.0-6.1.2 - The default list of dangerous files did not include SHTML files. On servers that executed these files, that could lead to code execution.
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Critical 9.8
WordPress Masteriyo - LMS plugin <= 2.3.2 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in ThemeGrill Masteriyo - LMS learning-management-system allows Upload a Web Shell to a Web Server.This issue affects Masteriyo - LMS: from n/a through 2.3.2.
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Critical 9.9
WordPress GP Premium plugin <= 2.5.5 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in EDGE22 Studios Ltd. GP Premium allows Remote Code Inclusion. This issue affects GP Premium: from n/a through 2.5.5.
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Critical 9.9
WordPress Templatiq plugin <= 0.2.5 - Arbitrary File Upload vulnerability
Contributor Arbitrary File Upload in Templatiq <= 0.2.5 versions.
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Critical 9.9
WordPress Sync Post With Other Site plugin <= 1.9.3 - Arbitrary File Upload vulnerability
Contributor Arbitrary File Upload in Sync Post With Other Site <= 1.9.3 versions.
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Critical 9.6
WordPress Piotnet Addons For Elementor Pro plugin <= 7.1.67 - Arbitrary File Upload vulnerability
Unauthenticated Arbitrary File Upload in Piotnet Addons For Elementor Pro <= 7.1.67 versions.