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 9.1
Chyrp Lite has a Path Traversal to Remote Code Execution
Chyrp Lite is an ultra-lightweight blogging engine. Prior to 2026.01, a path traversal vulnerability exists in the administration console that allows an administrator or a user with Change Settings permission to change the uploads path to any folder. This vul…
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Critical 9.3
Brave CMS has Unrestricted File Upload in BraveCMS via CKEditor Endpoint
Brave CMS is an open-source CMS. Prior to 2.0.6, an Unrestricted File Upload vulnerability in the CKEditor endpoint allows attackers to upload arbitrary files, including executable scripts. This may lead to Remote Code Execution (RCE) on the server, potential…
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Critical 9.8
Snews CMS 1.7 Unrestricted File Upload via snews_files
Snews CMS 1.7 contains an unrestricted file upload vulnerability that allows unauthenticated attackers to upload arbitrary files including PHP executables to the snews_files directory. Attackers can upload malicious PHP files through the multipart form-data u…
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Critical 9.1CVE-2026-2701 EPSS 55%
RCE vulnerability in Progress ShareFile Storage Zones Controller (SZC)
Authenticated user can upload a malicious file to the server and execute it, which leads to remote code execution.
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Critical 9.8
Unsafe Client MIME Type Handling Can Enable Arbitrary File Upload in plank/laravel-mediable
plank/laravel-mediable through version 6.4.0 can allow upload of a dangerous file type when an application using the package accepts or prefers a client-supplied MIME type during file upload handling. In that configuration, a remote attacker can submit a file…
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Critical 9.9
WordPress Green Downloads plugin <= 2.08 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in halfdata Green Downloads halfdata-paypal-green-downloads allows Using Malicious Files.This issue affects Green Downloads: from n/a through <= 2.08.
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Critical 9.1
WordPress Photo Engine plugin <= 6.4.9 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Jordy Meow Photo Engine wplr-sync allows Upload a Web Shell to a Web Server.This issue affects Photo Engine: from n/a through <= 6.4.9.
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Critical 9.9
WordPress WPJAM Basic plugin <= 6.9.2 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in denishua WPJAM Basic wpjam-basic allows Using Malicious Files.This issue affects WPJAM Basic: from n/a through <= 6.9.2.
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Critical 9.9
WordPress Ona theme < 1.24 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in deothemes Ona ona allows Upload a Web Shell to a Web Server.This issue affects Ona: from n/a through < 1.24.
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Critical 9.9
WordPress WPBookit Pro plugin <= 1.6.18 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in iqonicdesign WPBookit Pro wpbookit-pro allows Using Malicious Files.This issue affects WPBookit Pro: from n/a through <= 1.6.18.
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Critical 9.8CVE-2026-32985 Public exploit
Xerte Online Toolkits <= 3.14 Unauthenticated Template Import Arbitrary File Upload Leading to Remote Code Execution
Xerte Online Toolkits versions 3.14 and earlier contain an unauthenticated arbitrary file upload vulnerability in the template import functionality that allows remote attackers to execute arbitrary code by uploading a crafted ZIP archive containing malicious …
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Critical 9.1
WordPress Mobile App Editor plugin <= 1.3.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Syarif Mobile App Editor mobile-app-editor allows Upload a Web Shell to a Web Server.This issue affects Mobile App Editor: from n/a through <= 1.3.1.
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Critical 9.0CVE-2026-27540 Public exploit
WordPress Woocommerce Wholesale Lead Capture plugin <= 2.0.3.1 - Arbitrary File Upload vulnerability
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Critical 9.8
An arbitrary file upload vulnerability in aaPanel v7.57.0 allows attackers to execute arbitrary code via uploading a cr…
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Critical 9.8
Telesquare SKT LTE Router SDT-CS3B1 WebDAV Arbitrary File Upload
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Critical 9.8
Pix for WooCommerce <= 1.5.0 - Unauthenticated Arbitrary File Upload
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Critical 9.3
WWBN AVideo: Authenticated Remote Code Execution via Unsafe Plugin ZIP Extraction
WWBN AVideo is an open source video platform. Prior to version 24.0, an authenticated Remote Code Execution (RCE) vulnerability was identified in AVideo related to the plugin upload/import functionality. The issue allowed an authenticated administrator to upl…
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Critical 9.8
Microsoft Devices Pricing Program Remote Code Execution Vulnerability
Microsoft Devices Pricing Program Remote Code Execution Vulnerability
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Critical 10.0CVE-2026-21628 Public exploit
Extension - astroidframe.work - Unauthenticated Remote Code Execution in Astroid Framework 2.0.0 - 3.3.10 for Joomla
A improperly secured file management feature allows uploads of dangerous data types for unauthenticated users, leading to remote code execution.
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Critical 10.0
SEPPmail User Web Interface Arbitrary File Write to RCE
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Critical 9.1
WordPress WooCommerce License Manager plugin <= 7.0.6 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in firassaidi WooCommerce License Manager fs-license-manager allows Upload a Web Shell to a Web Server.This issue affects WooCommerce License Manager: from n/a through <= 7.0.6.
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Critical 9.9
WordPress Charety theme < 2.0.2 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in zozothemes Charety charety allows Using Malicious Files.This issue affects Charety: from n/a through < 2.0.2.
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Critical 9.1
WordPress AI Engine plugin <= 3.3.2 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Jordy Meow AI Engine ai-engine allows Using Malicious Files.This issue affects AI Engine: from n/a through <= 3.3.2.
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Critical 9.9
WordPress Keenarch theme < 2.0.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in zozothemes Keenarch keenarch allows Using Malicious Files.This issue affects Keenarch: from n/a through < 2.0.1.
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Critical 9.9
WordPress Lendiz theme < 2.0.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in zozothemes Lendiz lendiz allows Upload a Web Shell to a Web Server.This issue affects Lendiz: from n/a through < 2.0.1.
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Critical 9.9
WordPress Nutrie theme < 2.0.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in zozothemes Nutrie nutrie allows Upload a Web Shell to a Web Server.This issue affects Nutrie: from n/a through < 2.0.1.
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Critical 10.0
FreeScout 1.8.206 Patch Bypass for CVE-2026-27636 via Zero-Width Space Character Leads to Remote Code Execution
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Critical 9.3
Remote Code Execution via Unrestricted File Upload in DobryCMS
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Critical 9.4
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Critical 9.6
Cross-Site Scripting (XSS) vulnerability in the subtitle loading function of the asbplayer Chrome Extension version 1.1…
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Critical 9.9
WordPress Bravis Addons plugin <= 1.3.0 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in Bravis-Themes Bravis Addons bravis-addons allows Using Malicious Files.This issue affects Bravis Addons: from n/a through <= 1.3.0.
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Critical 9.9
WordPress Wiguard theme < 2.0.1 - Arbitrary File Upload vulnerability
Unrestricted Upload of File with Dangerous Type vulnerability in zozothemes Wiguard wiguard allows Upload a Web Shell to a Web Server.This issue affects Wiguard: from n/a through < 2.0.1.
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Critical 9.1
Authenticated arbitrary file upload via a System REST API requiring administrator permission.
A malicious actor with administrative privileges can upload an arbitrary file to a user-controlled location within the deployment via a system REST API. Successful uploads may lead to remote code execution. By leveraging the vulnerability, a malicious actor m…
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Critical 9.8
Slider Future <= 1.0.5 - Unauthenticated Arbitrary File Upload
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Critical 9.8
EFM iptime A6004MX timepro.cgi commit_vpncli_file_upload unrestricted upload
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Critical 9.8
midi-Synth <= 1.1.0 - Unauthenticated Arbitrary File Upload via 'export' AJAX Action
The midi-Synth plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type and file extension validation in the 'export' AJAX action in all versions up to, and including, 1.1.0. This makes it possible for unauthenticated attackers to…
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Critical 9.8
Airleader Master Unrestricted Upload of File with Dangerous Type
Airleader Master versions 6.381 and prior allow for file uploads without restriction to multiple webpages running maximum privileges. This could allow an unauthenticated user to potentially obtain remote code execution on the server.
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Critical 9.8
Insecure File Upload in NTN Informatics' Smart Panel
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Critical 9.8
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Critical 9.4
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