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
1,154 results · Clear filters · Feed
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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.
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Critical 9.8CVE-2026-15748 Public exploit
Forminator Forms <= 1.56.1 - Unauthenticated Arbitrary File Upload via Forged Upload Field Configuration
The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-exte…
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Critical 9.8
File Upload vulnerability in RainyGao-Hithub DocSys v.2.02.80 allows a remote attacker to execute arbitrary code
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Critical 9.8
ProSolution WP Client <= 2.0.10 - Unauthenticated Arbitrary File Upload via Content-Disposition Header Filename Override
The ProSolution WP Client plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.0.10 via the proSol_handleFileUpload function. This is due to missing validation of the attacker-controlled Content-Disposition heade…
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Critical 9.8
WebErpMesv2 has Unauthenticated RCE via Unrestricted File Upload in HR Expense scan_file (CWE-434)
WebErpMesv2 is a Resource Management and Manufacturing execution system Web for industry. Versions 1.19 and prior allow any self-registered user to upload arbitrary PHP files through the HR Expense scan_file parameter, leading to Remote Code Execution. Combin…
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Critical 9.8
WooCommerce Subscriptions < 9.1.0 - Unauthenticated RCE via PHP Object Injection
The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input before unserializing it on stores with High-Performance Order Storage enabled, leading to a PHP Object Injection issue which unauthenticated users can escalate to Remote …
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Critical 9.8
Gift Cards For WooCommerce Pro < 4.2.10 - Unauthenticated Arbitrary File Upload
The giftware WordPress plugin before 4.2.10 does not validate the type of uploaded files in one of its upload paths, allowing unauthenticated users to upload arbitrary files, including PHP code, which can lead to remote code execution.
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Critical 9.8
dulldusk phpfm - Unauthenticated Remote Code Execution via Unrestricted PHP File Upload
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Critical 9.8
Product Input Fields for WooCommerce < 2.0.2 - Unauthenticated Arbitrary File Upload
The Product Input Fields for WooCommerce WordPress plugin before 2.0.2 does not validate uploaded file types when its accepted-types setting is left empty, which its own documentation advertises as accepting all files, allowing unauthenticated attackers to up…
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Critical 9.8
Weaver E-cology 9.0 File Upload RCE via uploaderOperate.jsp
Weaver (Fanwei) E-cology 9.0 versions prior to 10.52 contain a file upload vulnerability that allows a remote, unauthenticated attacker to upload arbitrary files, including JSP webshells, by submitting a multipart/form-data POST request to /workrelate/plan/ut…
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Critical 9.8
Dinky Unauthenticated Arbitrary File Write via /download/uploadFromRsByLocal Gated Only by Hardcoded Default Token
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Critical 9.1
Arbitrary File Upload via System REST API in Multiple WSO2 Products Allows Remote Code Execution
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Critical 10.0
WordPress Type Hub plugin <= 2.0.6 - Arbitrary File Upload vulnerability
Unauthenticated Arbitrary File Upload in Type Hub <= 2.0.6 versions.
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Critical 9.8
ICS-Park Smart Park Management System v2.0 contains an unrestricted file upload vulnerability in the file upload module…
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Critical 9.8
Unrestricted File Upload in Bilin Software's HUMANIST Digital Human Resources
Unrestricted upload of file with dangerous type vulnerability in Bilin Software and Informatics Consultancy Inc. HUMANIST Digital Human Resources allows Upload a Web Shell to a Web Server. This issue affects HUMANIST Digital Human Resources: from 26.0 before …
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Critical 9.8
ImproveSEO <= 2.0.11 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution
The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to …
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Critical 9.8
Personal QR Message <= 1.0 - Unauthenticated Arbitrary File Upload
The Personal QR Message WordPress plugin through 1.0 does not restrict the file types that can be uploaded through an unauthenticated handler, allowing unauthenticated users to upload arbitrary executable PHP files that are directly reachable, leading to remo…
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Critical 9.8
Insert or Embed Articulate Content into WordPress <= 4.3000000027 - Editor+ Arbitrary File Upload
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Critical 9.8
Webinfos <= 1.2 - Unauthenticated Arbitrary File Upload
The Webinfos WordPress plugin through 1.2 does not validate the type or name of uploaded files, nor restrict the upload action with any authentication, capability, or nonce check, allowing unauthenticated attackers to upload arbitrary files (including PHP) to…
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Critical 9.8
Realtyna Organic IDX plugin + WPL Real Estate <= 5.2.0 - Unauthenticated Arbitrary File Upload via 'files[file]' Parameter via Public I/O 'set_property' Command
The Realtyna Organic IDX plugin + WPL Real Estate plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 5.2.0 via the upload function. This is due to missing file type validation in the upload function, combined wit…
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Critical 9.8CVE-2026-63223 Public exploit
CodeIgniter: Uploaded file extension validation bypass in is_image and mime_in rules
CodeIgniter is a PHP full-stack web framework. Prior to 4.7.4, the is_image and mime_in upload validation rules do not independently enforce a safe client filename extension, allowing a remote attacker to upload executable content when an application preserve…
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Critical 9.8
Admin and Site Enhancements (ASE) Pro <= 8.9.0 - Unauthenticated Remote Code Execution via PHP Code Injection via cfgroup[input] Repeater Row Key
The Admin and Site Enhancements (ASE) Pro plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 8.9.0 via the recursive_html function. This is due to the frontend save handler enforces only a publicly emitted nonce …
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Critical 9.4
Joomla Extension - balbooa.com - Authenticated arbitrary file upload in Gridbox < 2.20.2
Joomla Extension - balbooa.com - Authenticated arbitrary file upload in Gridbox < 2.20.2 - File upload methods allows authenticated attackers to upload arbitrary files. Turns into an authenticated RCE if combined with CVE-2026-65884 as the required account ca…
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Critical 9.9
Unrestricted SCORM file upload vulnerability
An unrestricted SCORM file upload vulnerability in Koollab LMS allowed an authenticated module designer to upload a SCORM package containing a PHP webshell to a publicly accessible directory and execute arbitrary code on the server.
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Critical 9.8CVE-2026-13714 Public exploit
Realtyna Organic IDX plugin + WPL Real Estate < 5.3.0 - Unauthenticated Arbitrary File Upload to Remote Code Execution
The Realtyna Organic IDX plugin + WPL Real Estate WordPress plugin before 5.3.0 does not validate the type of uploaded files, and its file upload functionality is gated only by an API that is enabled by default and authenticated with hardcoded credentials shi…
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Critical 9.3
SUNNET Corporate Training Management System - Unrestricted Upload of File with Dangerous Type
An unrestricted upload of file with dangerous type vulnerability in the e-paper draft upload function of SUNNET Corporate Training Management System through v10.3 allows remote authenticated users with administrator privileges to execute arbitrary commands by…
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Critical 9.1
WordPress Really Simple CSV Importer plugin <= 1.3 - Arbitrary File Upload vulnerability
Administrator Arbitrary File Upload in Really Simple CSV Importer <= 1.3 versions.
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Critical 9.1
WordPress MapSVG plugin <= 8.14.0 - Arbitrary File Upload vulnerability
Administrator Arbitrary File Upload in MapSVG <= 8.14.0 versions.
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Critical 9.1
WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
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Critical 9.8CVE-2026-14282 Public exploit
GoDAM <= 1.12.2 - Unauthenticated Arbitrary File Upload via WPForms File Upload Field
The GoDAM – Organize WordPress Media Library & File Manager with Unlimited Folders for Images, Videos & more plugin for WordPress is vulnerable to arbitrary file uploads in versions up to, and including, 1.12.2. This is due to insufficient file type validatio…
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Critical 9.4
Joomla Extension - joomlack.fr - Improper access control in Page Builder CK 1.0.0-3.1.2, 3.4.0-3.4.11, 3.5.0-3.6.2
Joomla Extension - joomlack.fr - Improper access control in Page Builder CK 1.0.0-3.1.2, 3.4.0-3.4.11, 3.5.0-3.6.2 - The Joomla extension Page Builder CK is vulnerable to an authenticated arbitrary file upload, leading to RCE.
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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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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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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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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 -
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…