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 7.2
Post Export Import with Media <= 1.13.1 - Authenticated (Administrator+) Arbitrary File Upload via Trailing-Dot Filename Bypass in ZIP Media Import
The Post Export Import with Media plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.13.1 via the import_media_file_secure function. This is due to insufficient file extension validation caused by a trailing-do…
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Critical 9.8
Super Forms <= 6.3.313 - Unauthenticated Arbitrary File Upload via 'data' Parameter (datauristring / value)
The Super Forms – Drag & Drop Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 6.3.313 via the submit_form function. This is due to missing file type validation and the absence of any capability ch…
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Medium 4.9
An authenticated administrator may be able to achieve arbitrary code execution on the host system by uploading a malici…
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Critical 10.0
Joomla Extension - balbooa.com - Unauthenticated file upload in Balbooa Forms extension < 2.4.1
Joomla Extension - balbooa.com - Unauthenticated file upload in Balbooa Forms extension < 2.4.1 - The Joomla extension Balbooa Forms is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
KEV Jul 10, 2026 -
Critical 9.8
Blocksy Companion <= 2.1.46 - Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter
The Blocksy Companion plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.1.46 via the save_attachments function. This is due to the Custom Fonts extension registering a wp_check_filetype_and_ext filter that app…
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Low 2.1
Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound e…
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Medium 4.3
Grav - Arbitrary File Upload via Avatar Endpoint
The Grav API plugin (getgrav/grav-plugin-api) 1.0.0 contains an unrestricted file upload vulnerability in the avatar upload endpoint (/api/v1/users/user/avatar). The endpoint validates only the client-declared MIME type (getClientMediaType) beginning with 'im…
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Critical 9.8CVE-2026-58480 Public exploit
Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments
Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Ad…
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High 8.8
WHMCS Bridge <= 6.9 - Unauthenticated Arbitrary File Upload via 'ccce' Parameter
The WHMCS Bridge plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the connect() function in all versions up to, and including, 6.9. This makes it possible for authenticated attackers, with Custom-level access…
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High 8.8
Widget Logic Visual <= 1.52 - Authenticated (Subscriber+) Remote Code Execution via 'nwlv[cod-tag]' Parameter
The Widget Logic Visual plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.52 via the widget_logic_visual_check_visibility function. This is due to missing capability check and nonce verification on the widget-…
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High 8.7
DataEase H2 RCE via Zip Protocol & File Dropper Fix bypass
DataEase is an open source data visualization and analysis tool. Prior to 2.10.24, a bypass of the H2 zip protocol and file dropper fix allows an authenticated attacker to upload a zip archive disguised with a .ttf extension through FontManage.saveFile and th…
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High 8.8CVE-2026-23697 Public exploit
Vtiger CRM < 8.4.0 Authenticated File Upload RCE via Documents Module
Vtiger CRM before 8.4.0 contains an authenticated file upload vulnerability that allows low-privileged users to achieve remote code execution by uploading a .phar file containing arbitrary PHP code through the Documents module, bypassing the extension denylis…
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High 7.2CVE-2026-23698 Public exploit
Vtiger CRM 8.4.0 Authenticated RCE via Module Import File Upload
Vtiger CRM through 8.4.0 contains an authenticated remote code execution vulnerability in the admin module import feature that allows administrator-level attackers to upload arbitrary PHP files by submitting a crafted zip archive through the ModuleManager imp…
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Critical 9.8
WPFunnels <= 3.12.7 - Unauthenticated Remote Code Execution via 'postData' Parameter
The WPFunnels – Funnel Builder for WooCommerce with Checkout & One Click Upsell plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 3.12.7 via the 'postData' parameter parameter. This is due to unsanitized write o…
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Low 3.1
Coolify: File Upload Without Type or Size Validation in Database Backup Restore
Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.474, the file upload endpoint (app/Http/Controllers/UploadController.php) for database backup restore uploads did not enforce file type or …
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Critical 9.8
Unvalidated File Upload vulnerability in ArcGIS Server.
Esri ArcGIS Server contains an unrestricted file upload vulnerability. An unauthenticated attacker could exploit this issue by uploading a crafted file to the affected endpoint. Successful exploitation could allow arbitrary file upload, potentially allowing f…
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Critical 9.8
Apache IoTDB: Path Traversal in DataNode Internal RPC Trigger JAR Upload Allows Arbitrary File Write
Apache IoTDB DataNode’s internal RPC interface for creating Trigger instances uses the uploaded Trigger JAR name to build a file path without sufficient validation. If the internal DataNode RPC port is exposed to an untrusted network, an attacker may use path…
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Medium 6.3
SourceCodester Onlne Examination & Learning Management System announcements.php unrestricted upload
A weakness has been identified in SourceCodester Onlne Examination & Learning Management System 1.0. Affected by this issue is some unknown functionality of the file /announcements.php. Executing a manipulation can lead to unrestricted upload. The attack can …
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Medium 6.3
SourceCodester Onlne Examination & Learning Management System Filename Extension upload_files.php pathinfo unrestricted upload
A security flaw has been discovered in SourceCodester Onlne Examination & Learning Management System 1.0. Affected by this vulnerability is the function pathinfo of the file /upload_files.php of the component Filename Extension. Performing a manipulation resu…
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Medium 6.3
SourceCodester Onlne Examination & Learning Management System process_lesson.php unrestricted upload
A vulnerability was identified in SourceCodester Onlne Examination & Learning Management System 1.0. Affected is an unknown function of the file /process_lesson.php. Such manipulation of the argument user_id leads to unrestricted upload. The attack may be lau…
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High 7.3
Ruijie RG-UAC user_auth_commit.php unrestricted upload
A vulnerability was found in Ruijie RG-UAC up to 1.0-R1.8.2.p5. The impacted element is an unknown function of the file user_auth_commit.php. Performing a manipulation of the argument upload_image results in unrestricted upload. The attack is possible to be c…
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Medium 6.3
SourceCodester Syllabus-Aligned Learning Management and Examination System upload_files.php unrestricted upload
A security flaw has been discovered in SourceCodester Syllabus-Aligned Learning Management and Examination System 1.0. Impacted is an unknown function of the file upload_files.php. Performing a manipulation results in unrestricted upload. The attack may be in…
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Critical 9.8
Yonyou KSOA 9.0 Unauthenticated File Upload RCE via ImageUpload Servlet
Yonyou KSOA 9.0 contains an unauthenticated arbitrary file upload vulnerability in the com.sksoft.bill.ImageUpload servlet that allows unauthenticated attackers to upload arbitrary files by submitting a POST request with attacker-controlled filepath and filen…
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Critical 9.8
Redsea Cloud eHR Unauthenticated File Upload RCE via PtFjk.mob
Redsea Cloud eHR contains an arbitrary file upload vulnerability that allows unauthenticated attackers to achieve remote code execution by uploading malicious files through the PtFjk.mob servlet endpoint. Attackers can submit a multipart POST request with a J…
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Critical 9.8
Divi Form Builder <= 5.1.8 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution via 'acceptFileTypes' Parameter
The Divi Form Builder plugin for WordPress is vulnerable to Arbitrary File Upload leading to Remote Code Execution in all versions up to and including 5.1.8. This is due to insufficient file extension validation in the do_image_upload() function where user-su…
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Critical 9.9
WordPress Zegen theme <= 1.1.9 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in Zegen <= 1.1.9 versions.
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Medium 5.3
Arbitrary File Upload in MCO
MCO does not correctly validate types of uploaded files. File upload validation functionality relies only on client-side checks, which can be bypassed. An authorized, low-privileged attacker can upload files with arbitrary types to the server. Because vendor …
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Critical 10.0
ColdFusion | Unrestricted Upload of File with Dangerous Type (CWE-434)
ColdFusion versions 2025.9, 2023.20 and earlier are 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. Exploitation of this issue does not require user…
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Critical 10.0
ColdFusion | Unrestricted Upload of File with Dangerous Type (CWE-434)
ColdFusion versions 2025.9, 2023.20 and earlier are 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. Exploitation of this issue does not require user…
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High 8.6
Remote Code Execution in Redeight CMS
An Unrestricted File Upload vulnerability in Redeight CMS version 1.0 allows authenticated attackers to achieve Remote Code Execution via the POST "/admin/index.php?module=pages&mode=FileAdd" endpoint. The application fails to validate file extensions and MIM…
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High 7.8
An unrestricted file upload vulnerability in Nokia MantaRay NM
Nokia MantaRay NM is subject to an unrestricted file upload vulnerability due to insufficient file type validation. Successful exploitation could allow an authenticated attacker to upload malicious files onto the system.
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Critical 10.0
Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0
Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0 - The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
KEV Jul 7, 2026 -
High 8.6
Remote Code Execution in SzafirHost
SzafirHost verifies the downloaded native library archive with one JarFile parser (reading the Central Directory) but extracts native libraries with JarInputStream parser (reading sequentially from local file headers). An attacker who controls the served arch…
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High 7.3
itsourcecode Online Hotel Management System controller.php add unrestricted upload
A flaw has been found in itsourcecode Online Hotel Management System 1.0. Affected is an unknown function of the file /admin/mod_amenities/controller.php?action=add. Executing a manipulation of the argument image can lead to unrestricted upload. It is possibl…
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High 7.3
Hanwang e-Face General Management Platform upload.do unrestricted upload
A vulnerability was determined in Hanwang e-Face General Management Platform 6.3.5.4. This issue affects some unknown processing of the file /manage/resourceUpload/upload.do. Executing a manipulation of the argument File can lead to unrestricted upload. The a…
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High 7.2
H.VIEW HV-500S6 IP Camera Unrestricted Upload of File with Dangerous Type
A vulnerability exists in H.View IP cameras certificate-related upload interfaces allow authenticated users to store arbitrary file content to fixed, persistent filesystem locations without validating file type, structure, or size. This design omission enable…
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High 7.1
Daktronics Controller Firmware Unrestricted Upload of File with Dangerous Type
The DMP-5000 file service exposes authenticated arbitrary file upload functionality. There are exposed endpoints which allows authenticated users to upload files of any type without validation. No file extension filtering or content inspection is enforced whi…
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Critical 9.1
WordPress TemplateSpare plugin <= 4.2.0 - Arbitrary File Upload vulnerability
Administrator Arbitrary File Upload in TemplateSpare <= 4.2.0 versions.
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Critical 9.9
WordPress Travel Booking theme <= 2.2.5 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in Travel Booking <= 2.2.5 versions.
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Critical 9.9
WordPress Quform plugin <= 2.23.0 - Arbitrary File Upload vulnerability
Subscriber Arbitrary File Upload in Quform <= 2.23.0 versions.