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
3,334 results · Feed
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High 7.3
decolua 9router Administrative API Endpoint api authorization
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Medium 4.3
MStore API <= 4.18.3 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary User Meta Update
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Medium 4.3
Authorization Bypass Through User-Controlled Key in GitLab
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Medium 4.3
Policy bypass in Blink in Google Chrome prior to 147.0.7727.55 allowed a remote attacker to perform UI spoofing via a c…
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High 8.3
InvenTree has Arbitrary API Token Creation
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Medium 6.3
LORIS has incorrect access checks in document_repository
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Medium 6.3
LORIS has incorrect access checks in media module
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High 7.4
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Medium 4.3
Wimi Teamwork On-Premises < 8.2.0 IDOR via preview.php
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Medium 5.3
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Medium 5.4
WordPress WpStream plugin < 4.11.2 - Insecure Direct Object References (IDOR) vulnerability
Authorization Bypass Through User-Controlled Key vulnerability in wpstream WpStream wpstream allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WpStream: from n/a through < 4.11.2.
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Low 2.7
WordPress Image Photo Gallery Final Tiles Grid plugin <= 3.6.11 - Insecure Direct Object References (IDOR) vulnerability
Authorization Bypass Through User-Controlled Key vulnerability in WP Chill Image Photo Gallery Final Tiles Grid final-tiles-grid-gallery-lite allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Image Photo Gallery Final …
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Medium 4.3
Blog2Social: Social Media Auto Post & Scheduler <= 8.8.3 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary Post Schedule Modification via 'b2s_id' Parameter
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Medium 5.3
Awesome Support <= 6.3.7 - Authenticated (Subscriber+) Insecure Direct Object Reference to Unauthorized Ticket Reply Access via 'ticket_id' Parameter
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Medium 5.3
Masteriyo LMS <= 2.1.7 - Unauthenticated Authorization Bypass to Arbitrary Order Completion via Stripe Webhook Endpoint
The Masteriyo LMS – Online Course Builder for eLearning, LMS & Education plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key in versions up to and including 2.1.7. This is due to insufficient webhook signature verification i…
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Medium 6.5
Plane IDOR: Cross-Project Issue Date Modification via Bulk Update Endpoint
Plane is an an open-source project management tool. Prior to 1.3.0, the IssueBulkUpdateDateEndpoint allows a project member (ADMIN or MEMBER) to modify the start_date and target_date of ANY issue across the entire Plane instance, regardless of workspace or pr…
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Medium 6.5
Scoold has an Authenticated Arbitrary Question Overwrite via Client-Controlled postId in POST /questions/ask
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High 8.1
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Medium 6.9CVE-2026-35584 Public exploit
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High 7.6
FreeScout Customer Merge Cross-Mailbox Authorization Bypass
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High 7.3
Tandoor Recipes — `amount`/`unit` bypass serializer in `food/{id}/shopping/`
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High 8.8CVE-2026-5465 Public exploit
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High 7.1
Brave CMS has an Insecure Direct Object Reference in Article Image Deletion
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Medium 6.5
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High 8.1CVE-2026-35045 Public exploit
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High 7.9CVE-2026-34444 Public exploit
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Medium 4.3
Incorrect access control in Kaleris YMS v7.2.2.1 allows authenticated attackers with only the shipping/receiving role t…
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High 8.1
WCFM - WooCommerce Frontend Manager <= 6.7.25 - Insecure Direct Object References to Autenticated (Vendor+) Arbitrary Post/Product Manipulation
The WCFM – Frontend Manager for WooCommerce along with Bookings Subscription Listings Compatible plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 6.7.25 via multiple AJAX actions including `wcfm_modi…
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Critical 9.1CVE-2026-25197 Public exploit
Gardyn Cloud API Authorization Bypass Through User-Controlled Key
A specific endpoint allows authenticated users to pivot to other user profiles by modifying the id number in the API call.
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Medium 4.3
Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)
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Medium 6.5
Scoold: Cross-Account Feedback Deletion (IDOR)
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Medium 5.4
listmonk: Broken Access Control in CSV Import (Unauthorized List Assignment)
listmonk is a standalone, self-hosted, newsletter and mailing list manager. From version 4.1.0 to before version 6.1.0, bugs in list permission checks allows users in a multi-user environment to access to lists (which they don't have access to) under differen…
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Medium 5.3
SourceCodester Leave Application System User Information index.php authorization
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Medium 5.6
Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization
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Low 2.3
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Medium 4.3
User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor <= 3.15.5 - Insecure Direct Object Reference to Authenticated (Subscriber+) Arbitrary Post Author Reassignment via Avatar Field
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Medium 6.5
OpenClaw < 2026.3.11 - Account-Scoped configWrites Policy Bypass via Channel Commands
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High 7.0
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High 8.8
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High 8.7
Authorization Bypass in ON24 Q&A chat
A vulnerability of authorization bypass through user-controlled key in the 'console-survey/api/v1/answer/{EVENTID}/{TIMESTAMP}/' endpoint. Exploiting this vulnerability would allow an unauthenticated attacker to enumerate event IDs and obtain the complete Q&A…