Weakness (CWE)
CWE-639: Authorization Bypass Through User-Controlled Key
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
More detail
It is likely that an attacker would have to be an authenticated user in the system. However, the authorization process would not properly check the data access operation to ensure that the authenticated user performing the operation has sufficient entitlements to perform the requested data access, hence bypassing any other authorization checks present in the system.
For example, attackers can look at places where user specific data is retrieved (e.g. search screens) and determine whether the key for the item being looked up is controllable externally. The key may be a hidden field in the HTML form field, might be passed as a URL parameter or as an unencrypted cookie variable, then in each of these cases it will be possible to tamper with the key value.
How to prevent it (3 mitigations)
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Architecture and Design
For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.
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Architecture and Design, Implementation
Make sure that the key that is used in the lookup of a specific user's record is not controllable externally by the user or that any tampering can be detected.
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Architecture and Design
Use encryption in order to make it more difficult to guess other legitimate values of the key or associate a digital signature with the key so that the server can verify that there has been no tampering.
Source: MITRE CWE-639
1,891 results · Clear filters · Feed
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Medium 4.3
Shopware: Unauthorized Payment Trigger for Foreign Orders via /store-api/handle-payment
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Medium 6.5
Chat2DB < 5.3.0 Insecure Direct Object Reference via GET /api/connection/datasource
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Medium 6.5
IDOR in GIS Informatics' GisLab Laboratory Management System
Authorization bypass through User-Controlled key vulnerability in Gis Informatics Engineering Consulting Laboratory R&D and Software Services Inc. GisLab Laboratory Management System allows Exploitation of Trusted Identifiers. This issue affects GisLab Labora…
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Medium 6.5
TheHive 4.1.24 Broken Object Level Authorization via Attachment Download Endpoints
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Medium 6.5
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Medium 5.3
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Medium 5.4
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Medium 4.3
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Medium 6.5
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Medium 5.3
Activepieces: Cross-tenant file download via missing JWT audience check on step-files signed URL
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Medium 4.3
Keycloak-services: keycloak-services: group hierarchy search discloses hidden parent groups under fgap v2
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Medium 4.3
Microsoft UFO: Missing Authorization in DEVICE_INFO_REQUEST Allows a DEVICE Client to Read Another Device's system_info
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Medium 4.3
SimpleChat: Authenticated users can access other users' profile metadata through user IDOR endpoints
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Medium 6.9
IDOR in Prospero Flow CRM Order API allows cross-tenant read and modification of orders
Authorization Bypass Through User-Controlled Key (CWE-639) in the Order and OrderItem REST API controllers in Roskus Prospero Flow CRM before 5.5.3 allows a remote, authenticated user to read, modify, and delete orders and order items belonging to any other c…
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Medium 5.9
AI Engine < 3.5.5 - Subscriber+Chatbot Discussion Disclosure and Takeover via IDOR
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Medium 6.3
RafyMrX TOKO-ONLINE-ROTI add.php authorization
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Medium 6.5
Wekan: `cloneBoard` Meteor method has no authorization check — any user can clone (read) any private board by ID
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Medium —
MantisBT: REST and SOAP API Issue Update Accepts Unreleased Product Versions From Updaters
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Medium 6.5
Apollo: Apollo Portal release endpoint allows cross-application configuration disclosure via releaseId
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Medium 6.0
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Medium 6.3
n8n - External Secrets Disclosure via Workflow Node Expressions
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Medium 6.9
Authorization bypass in Prospero Flow CRM Excel import allows cross-tenant record injection
Authorization Bypass Through User-Controlled Key (CWE-639) in the Excel import handlers (CustomerImport, LeadImport, ProductImport) in Roskus Prospero Flow CRM before 5.14.0 allows a remote, authenticated user of any role or company to create customer, lead, …
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Medium 5.5
Kali Forms < 2.4.17 - Contributor+ Arbitrary Post Metadata Disclosure via IDOR
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Medium 6.9
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Medium 4.3
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Medium 5.3
poco-ai poco-claw Workspace API workspace.py get_workspace_file authorization
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Medium 4.3
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Medium 6.5
WordPress Tutor LMS plugin <= 3.9.13 - Insecure Direct Object References (IDOR) vulnerability
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Medium 4.9
Incoming webhook user attribution via unvalidated webhook owner
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Medium 4.3
Authenticated remote cluster can modify or delete posts it does not own in Mattermost Connected Workspaces shared channels
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify post ownership in the shared channel inbound sync handler, which allows an authenticated remote cluster to modify or delete posts authored by local users or other remot…
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Medium 5.6
MacCMS Pro Installation Index.php step5 authorization
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Medium 4.3
WCFM – Frontend Manager for WooCommerce <= 6.7.27 - Authenticated (Subscriber+) Missing Authorization to Arbitrary Vendor Data Manipulation via Multiple AJAX Handlers
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Medium 4.3
PDF Invoices & Packing Slips for WooCommerce <= 5.14.0 - Insecure Direct Object Reference to Authenticated (Contributor+) Sensitive Information Disclosure via 'order_id' Shortcode Attribute
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Medium 5.0
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Medium 5.3
Snipe-IT: Missing object-level authorization in Kits API
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Medium 4.3CVE-2026-12400 Public exploit
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Medium 5.3
Easy Upload Files During Checkout <= 3.0.1 - Missing Authorization to Unauthenticated Arbitrary Attachment Deletion via 'eufdc-delete' Parameter
The Easy Upload Files During Checkout plugin for WordPress is vulnerable to unauthorized access in all versions up to, and including, 3.0.1. This is due to missing authorization checks in the ufdc_custom_init() function, which processes the 'eufdc-delete' par…
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Medium 5.3
Ghost: Paid gift memberships obtainable at minimal cost via the donations feature
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Medium 6.3
mettle sendportal Campaign Creation Endpoint CampaignStoreRequest.php authorization
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Medium 4.3
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