Common Weakness Enumeration

CWE-639

Weakness Allowed

Authorization Bypass Through User-Controlled Key

Abstraction: Base · Status: Incomplete

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.

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.

Mapping guidance

This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.

Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

Relationships and members
ChildOf: CWE-863 · View CWE-1000
ChildOf: CWE-863 · View CWE-1003
ChildOf: CWE-284 · View CWE-1340
Modes of introduction
Architecture and Design

REALIZATION: This weakness is caused during implementation of an architectural security tactic.

Architecture and Design

Retrieval of a user record occurs in the system based on some key value that is under user control. The key would typically identify a user-related record stored in the system and would be used to lookup that record for presentation to the user.

Implementation

One manifestation of this weakness is when a system uses sequential or otherwise easily-guessable session IDs that would allow one user to easily switch to another user's session and read/modify their data.

Detection methods

Automated Static Analysis

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)

Effectiveness: High

Notes

Maintenance

As of CWE 4.20, the relationship between IDOR and BOLA needs to be investigated more closely, including research into how these terms are used in the industry. The CWE team suspects that IDOR can be a part of BOLA, but BOLA expands on the weakness inherent to IDOR in that it is not only about objects that are being directly referenced.

Content history
Submission: Evgeny Lebanidze · Cigital · 2008-01-30 · CWE Draft 8
Contribution: Mateus Godinho Pantoja · 2024-08-09 · CWE 4.20

Suggested corrections to use of IDOR versus BOLA

Modification: CWE Content Team · MITRE · 2008-09-08 · CWE 1.0

updated Common_Consequences, Relationships, Type

Modification: CWE Content Team · MITRE · 2008-10-14 · CWE 1.0.1

updated Description

Modification: CWE Content Team · MITRE · 2009-03-10 · CWE 1.3

updated Relationships

Modification: CWE Content Team · MITRE · 2009-05-27 · CWE 1.4

updated Relationships

Modification: CWE Content Team · MITRE · 2009-10-29 · CWE 1.6

updated Common_Consequences

Modification: CWE Content Team · MITRE · 2010-06-21 · CWE 1.9

updated Relationships

Modification: CWE Content Team · MITRE · 2011-03-29 · CWE 1.12

updated Alternate_Terms, Applicable_Platforms, Description, Name, Potential_Mitigations, Relationships

Modification: CWE Content Team · MITRE · 2011-06-01 · CWE 1.13

updated Common_Consequences, Relationships

Modification: CWE Content Team · MITRE · 2012-05-11 · CWE 2.2

updated Relationships

Modification: CWE Content Team · MITRE · 2013-02-21 · CWE 2.4

updated Alternate_Terms, Common_Consequences

Modification: CWE Content Team · MITRE · 2013-07-17 · CWE 2.5

updated Relationships

Modification: CWE Content Team · MITRE · 2014-07-30 · CWE 2.8

updated Relationships

Modification: CWE Content Team · MITRE · 2017-11-08 · CWE 3.0

updated Description, Enabling_Factors_for_Exploitation, Modes_of_Introduction, Relationships

Modification: CWE Content Team · MITRE · 2018-03-27 · CWE 3.1

updated Relationships

Modification: CWE Content Team · MITRE · 2019-06-20 · CWE 3.3

updated Relationships

Modification: CWE Content Team · MITRE · 2020-02-24 · CWE 4.0

updated Relationships

Modification: CWE Content Team · MITRE · 2020-06-25 · CWE 4.1

updated Alternate_Terms

Modification: CWE Content Team · MITRE · 2020-12-10 · CWE 4.3

updated Relationships

Modification: CWE Content Team · MITRE · 2021-03-15 · CWE 4.4

updated Alternate_Terms

Modification: CWE Content Team · MITRE · 2021-10-28 · CWE 4.6

updated Relationships

Modification: CWE Content Team · MITRE · 2023-04-27 · CWE 4.11

updated Detection_Factors, Relationships

Modification: CWE Content Team · MITRE · 2023-06-29 · CWE 4.12

updated Mapping_Notes

Modification: CWE Content Team · MITRE · 2023-10-26 · CWE 4.13

updated Observed_Examples

Modification: CWE Content Team · MITRE · 2024-02-29 · CWE 4.14

updated Demonstrative_Examples

Modification: CWE Content Team · MITRE · 2025-12-11 · CWE 4.19

updated References, Relationships, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2026-04-30 · CWE 4.20

updated Alternate_Terms, Maintenance_Notes, References

Modification: CWE Content Team · MITRE · 2026-10-28 · CWE 5.0

updated Description, Modes_of_Introduction, Time_of_Introduction

5740 vulnerabilities reference this CWE, most recent first.

CVE-2023-48783 (GCVE-0-2023-48783)

Vulnerability from cvelistv5 – Published: 2024-01-10 17:51 – Updated: 2025-06-17 20:59
VLAI
Summary
An Authorization Bypass Through User-Controlled Key vulnerability [CWE-639] affecting PortiPortal version 7.2.1 and below, version 7.0.6 and below, version 6.0.14 and below, version 5.3.8 and below may allow a remote authenticated user with at least read-only permissions to access to other organization endpoints via crafted GET requests.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-01-10 19:04 UTC
CWE
  • CWE-639 - Improper access control
Assigner
fortinet CNA under the mitre root
CNA scorecard C 72/100 over 47 records in the last 180 days details
References
Impacted products
Vendor Product Version
Fortinet FortiPortal Affected: 7.2.0 , ≤ 7.2.1 (semver)
Affected: 7.0.0 , ≤ 7.0.6 (semver)
Affected: 6.0.0 , ≤ 6.0.14 (semver)
Affected: 5.3.0 , ≤ 5.3.8 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2023-48304 (GCVE-0-2023-48304)

Vulnerability from cvelistv5 – Published: 2023-11-21 22:06 – Updated: 2024-08-02 21:23
VLAI
Title
Nextcloud Server vulnerable to attacker enabling/disabling birthday calendar for any user
Summary
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and starting in version 22.0.0 and prior to versions 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Enterprise Server, an attacker could enable and disable the birthday calendar for any user on the same server. Nextcloud Server 25.0.11, 26.0.6, and 27.1.0 and Nextcloud Enterprise Server 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 contain patches for this issue. No known workarounds are available.
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7836 records in the last 180 days details
References
Impacted products
Vendor Product Version
nextcloud security-advisories Affected: >= 25.0.0, < 25.0.11
Affected: >= 26.0.0, < 26.0.6
Affected: >= 27.0.0, < 27.1.0
Affected: >= 22.0.0, < 22.2.10.16
Affected: >= 23.0.0, < 23.0.12.11
Affected: >= 24.0.0, < 24.0.12.7
Create a notification for this product.
Show details on NVD website

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CVE-2023-47543 (GCVE-0-2023-47543)

Vulnerability from cvelistv5 – Published: 2024-11-12 18:53 – Updated: 2024-11-13 18:28
VLAI
Summary
An authorization bypass through user-controlled key vulnerability [CWE-639] in Fortinet FortiPortal version 7.0.0 through 7.0.3 allows an authenticated attacker to interact with ressources of other organizations via HTTP or HTTPS requests.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-13 18:27 UTC
CWE
  • CWE-639 - Improper access control
Assigner
fortinet CNA under the mitre root
CNA scorecard C 72/100 over 47 records in the last 180 days details
References
Impacted products
Vendor Product Version
Fortinet FortiPortal Affected: 7.0.0 , ≤ 7.0.3 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2023-47191 (GCVE-0-2023-47191)

Vulnerability from cvelistv5 – Published: 2023-12-21 18:26 – Updated: 2026-04-28 16:08
VLAI
Title
WordPress Youzify Plugin <= 1.2.2 is vulnerable to Insecure Direct Object References (IDOR)
Summary
Authorization Bypass Through User-Controlled Key vulnerability in KaineLabs Youzify – BuddyPress Community, User Profile, Social Network & Membership Plugin for WordPress.This issue affects Youzify – BuddyPress Community, User Profile, Social Network & Membership Plugin for WordPress: from n/a through 1.2.2.
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3451 records in the last 180 days details
References
Show details on NVD website

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CVE-2023-46646 (GCVE-0-2023-46646)

Vulnerability from cvelistv5 – Published: 2023-12-21 20:45 – Updated: 2024-11-27 18:41
VLAI
Summary
Improper access control in all versions of GitHub Enterprise Server allows unauthorized users to view private repository names via the "Get a check run" API endpoint. This vulnerability did not allow unauthorized access to any repository content besides the name. This vulnerability affected GitHub Enterprise Server version 3.7.0 and above and was fixed in version 3.17.19, 3.8.12, 3.9.7 3.10.4, and 3.11.0.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-27 18:41 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
GitHub_P CNA under the mitre root
CNA scorecard B 84/100 over 22 records in the last 180 days details
Impacted products
Vendor Product Version
GitHub Enterprise Server Affected: 3.7.0 , ≤ 3.7.18 (semver)
Affected: 3.8.0 , ≤ 3.8.11 (semver)
Affected: 3.9.0 , ≤ 3.9.6 (semver)
Affected: 3.10.0 , ≤ 3.10.3 (semver)
Unaffected: 3.11.0
Create a notification for this product.
Credits
Show details on NVD website

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CVE-2023-46311 (GCVE-0-2023-46311)

Vulnerability from cvelistv5 – Published: 2023-12-20 13:32 – Updated: 2026-04-28 16:08
VLAI
Title
WordPress wpDiscuz Plugin <= 7.6.3 is vulnerable to Insecure Direct Object References (IDOR)
Summary
Authorization Bypass Through User-Controlled Key vulnerability in gVectors Team Comments – wpDiscuz.This issue affects Comments – wpDiscuz: from n/a through 7.6.3.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-12 20:04 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3451 records in the last 180 days details
References
Impacted products
Vendor Product Version
gVectors Team Comments – wpDiscuz Affected: n/a , ≤ 7.6.3 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2023-45808 (GCVE-0-2023-45808)

Vulnerability from cvelistv5 – Published: 2024-04-15 17:28 – Updated: 2024-08-02 20:29
VLAI
Title
iTop missing silo check on extkey in console and portal
Summary
iTop is an IT service management platform. When creating or updating an object, extkey values aren't checked to be in the current user silo. In other words, by forging an http request, the user can create objects pointing to out of silo objects (for example a UserRequest in an out of scope Organization). Fixed in iTop 2.7.10, 3.0.4, 3.1.1, and 3.2.0.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-15 18:04 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7836 records in the last 180 days details
Impacted products
Vendor Product Version
Combodo iTop Affected: < 2.7.10
Affected: >= 3.0.0, < 3.0.4
Affected: >= 3.1.0, < 3.1.1
Create a notification for this product.
Show details on NVD website

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CVE-2023-44981 (GCVE-0-2023-44981)

Vulnerability from cvelistv5 – Published: 2023-10-11 11:55 – Updated: 2025-04-23 16:15
VLAI
Title
Apache ZooKeeper: Authorization bypass in SASL Quorum Peer Authentication
Summary
Authorization Bypass Through User-Controlled Key vulnerability in Apache ZooKeeper. If SASL Quorum Peer authentication is enabled in ZooKeeper (quorum.auth.enableSasl=true), the authorization is done by verifying that the instance part in SASL authentication ID is listed in zoo.cfg server list. The instance part in SASL auth ID is optional and if it's missing, like 'eve@EXAMPLE.COM', the authorization check will be skipped. As a result an arbitrary endpoint could join the cluster and begin propagating counterfeit changes to the leader, essentially giving it complete read-write access to the data tree. Quorum Peer authentication is not enabled by default. Users are recommended to upgrade to version 3.9.1, 3.8.3, 3.7.2, which fixes the issue. Alternately ensure the ensemble election/quorum communication is protected by a firewall as this will mitigate the issue. See the documentation for more details on correct cluster administration.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:27 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1199 records in the last 180 days details
Impacted products
Vendor Product Version
Apache Software Foundation Apache ZooKeeper Affected: 3.9.0 , < 3.9.1 (maven)
Affected: 3.8.0 , ≤ 3.8.2 (maven)
Affected: 3.7.0 , ≤ 3.7.1 (maven)
Affected: 0 , < 3.7.0 (maven)
Create a notification for this product.
Show details on NVD website

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CVE-2023-44254 (GCVE-0-2023-44254)

Vulnerability from cvelistv5 – Published: 2024-09-10 14:37 – Updated: 2024-09-10 17:13
VLAI
Summary
An authorization bypass through user-controlled key [CWE-639] vulnerability in FortiAnalyzer version 7.4.1 and before 7.2.5 and FortiManager version 7.4.1 and before 7.2.5 may allow a remote attacker with low privileges to read sensitive data via a crafted HTTP request.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:13 UTC
CWE
Assigner
fortinet CNA under the mitre root
CNA scorecard C 72/100 over 47 records in the last 180 days details
References
Impacted products
Vendor Product Version
Fortinet FortiAnalyzer Affected: 7.4.0
Affected: 7.2.0 , ≤ 7.2.4 (semver)
Affected: 7.0.0 , ≤ 7.0.12 (semver)
Affected: 6.4.0 , ≤ 6.4.14 (semver)
Affected: 6.2.0 , ≤ 6.2.12 (semver)
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Create a notification for this product.
Fortinet FortiManager Affected: 7.4.0
Affected: 7.2.0 , ≤ 7.2.4 (semver)
Affected: 7.0.0 , ≤ 7.0.12 (semver)
Affected: 6.4.0 , ≤ 6.4.14 (semver)
Affected: 6.2.0 , ≤ 6.2.12 (semver)
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Create a notification for this product.
Show details on NVD website

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CVE-2023-44249 (GCVE-0-2023-44249)

Vulnerability from cvelistv5 – Published: 2023-10-10 16:48 – Updated: 2025-02-13 17:13
VLAI
Summary
An authorization bypass through user-controlled key [CWE-639] vulnerability in Fortinet FortiManager version 7.4.0 and before 7.2.3 and FortiAnalyzer version 7.4.0 and before 7.2.3 allows a remote attacker with low privileges to read sensitive information via crafted HTTP requests.
CWE
Assigner
fortinet CNA under the mitre root
CNA scorecard C 72/100 over 47 records in the last 180 days details
Impacted products
Vendor Product Version
Fortinet FortiManager Affected: 7.4.0
Affected: 7.2.0 , ≤ 7.2.3 (semver)
Affected: 7.0.0 , ≤ 7.0.9 (semver)
Affected: 6.4.0 , ≤ 6.4.13 (semver)
Affected: 6.2.0 , ≤ 6.2.12 (semver)
Create a notification for this product.
Fortinet FortiAnalyzer Affected: 7.4.0
Affected: 7.2.0 , ≤ 7.2.3 (semver)
Affected: 7.0.0 , ≤ 7.0.9 (semver)
Affected: 6.4.0 , ≤ 6.4.13 (semver)
Affected: 6.2.0 , ≤ 6.2.12 (semver)
Create a notification for this product.
Show details on NVD website

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Mitigation
Architecture and Design

For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.

Mitigation
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.

Mitigation
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.

No CAPEC attack patterns related to this CWE.