CWE-639
Weakness AllowedAuthorization 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
Modes of introduction
REALIZATION: This weakness is caused during implementation of an architectural security tactic.
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.
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
Suggested corrections to use of IDOR versus BOLA
updated Common_Consequences, Relationships, Type
updated Description
updated Relationships
updated Relationships
updated Common_Consequences
updated Relationships
updated Alternate_Terms, Applicable_Platforms, Description, Name, Potential_Mitigations, Relationships
updated Common_Consequences, Relationships
updated Relationships
updated Alternate_Terms, Common_Consequences
updated Relationships
updated Relationships
updated Description, Enabling_Factors_for_Exploitation, Modes_of_Introduction, Relationships
updated Relationships
updated Relationships
updated Relationships
updated Alternate_Terms
updated Relationships
updated Alternate_Terms
updated Relationships
updated Detection_Factors, Relationships
updated Mapping_Notes
updated Observed_Examples
updated Demonstrative_Examples
updated References, Relationships, Weakness_Ordinalities
updated Alternate_Terms, Maintenance_Notes, References
updated Description, Modes_of_Introduction, Time_of_Introduction
5519 vulnerabilities reference this CWE, most recent first.
GCVE-1337-2026-000000000… (CVE-2026-105040)
Vulnerability from gna-1337 – Published: 2026-10-15 20:43 – Updated: 2026-10-15 20:43 Exclusively Hosted Service- CWE-639 - Authorization Bypass Through User-Controlled Key
| URL | Tags |
|---|---|
| https://github.com/xn0tsa/your-secrets-are-safe-with-me | technical-description |
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| https://www.theverge.com/tech/1010727/eiliko-robo… | media-coverage |
| Vendor | Product | Version | |
|---|---|---|---|
| EnergizeLab | NestJS auth service |
Affected:
1.8.2
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CVE-2026-122308 (GCVE-0-2026-122308)
Vulnerability from cvelistv5 – Published: 2026-11-05 02:25 – Updated: 2026-11-05 02:25- CWE-639 - Authorization Bypass Through User-Controlled Key
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CVE-2026-122019 (GCVE-0-2026-122019)
Vulnerability from cvelistv5 – Published: 2026-11-04 21:45 – Updated: 2026-11-04 21:45| URL | Tags |
|---|---|
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CVE-2026-122007 (GCVE-0-2026-122007)
Vulnerability from cvelistv5 – Published: 2026-11-04 14:46 – Updated: 2026-11-04 18:36 X_Open Source- CWE-639 - Authorization Bypass Through User-Controlled Key
| URL | Tags |
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| Vendor | Product | Version | |
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Affected:
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CVE-2026-121945 (GCVE-0-2026-121945)
Vulnerability from cvelistv5 – Published: 2026-11-04 12:31 – Updated: 2026-11-04 18:44- CWE-639 - Authorization Bypass Through User-Controlled Key
| URL | Tags |
|---|---|
| https://github.com/coopcycle/coopcycle-web/issues/5390 | issue-tracking |
| https://hackmd.io/@hieund/coopcycle-incident-cour… | third-party-advisory |
| https://github.com/coopcycle/coopcycle-web/commit… | patch |
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| https://www.vulncheck.com/advisories/coopcycle-co… | third-party-advisory |
| https://hackmd.io/@hieund/cve-2026-121945-coopcyc… | exploit |
| Vendor | Product | Version | |
|---|---|---|---|
| CoopCycle | coopcycle-web |
Affected:
0 , < 6.20.1
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CVE-2026-121940 (GCVE-0-2026-121940)
Vulnerability from cvelistv5 – Published: 2026-11-04 12:31 – Updated: 2026-11-04 18:53- CWE-639 - Authorization Bypass Through User-Controlled Key
| URL | Tags |
|---|---|
| https://github.com/Stonewuu/ai-fusion-video/issues/69 | issue-tracking |
| https://hackmd.io/@hieuPenguinnn/ai-fusion-video-… | third-party-advisory |
| https://github.com/Stonewuu/ai-fusion-video/commi… | patch |
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| https://www.vulncheck.com/advisories/stonewuu-ai-… | third-party-advisory |
| https://hackmd.io/@hieuPenguinnn/cve-2026-121940-… | exploit |
| Vendor | Product | Version | |
|---|---|---|---|
| Stonewuu | ai-fusion-video |
Affected:
0 , < 1.3.0
(semver)
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CVE-2026-121938 (GCVE-0-2026-121938)
Vulnerability from cvelistv5 – Published: 2026-11-04 12:31 – Updated: 2026-11-04 18:50- CWE-639 - Authorization Bypass Through User-Controlled Key
| URL | Tags |
|---|---|
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| https://hackmd.io/@hieuPenguinnn/langchain4j-aide… | third-party-advisory |
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| https://github.com/moyangzhan/langchain4j-aideepi… | technical-description |
| https://www.vulncheck.com/advisories/langchain4j-… | third-party-advisory |
| https://hackmd.io/@hieuPenguinnn/cve-2026-121938-… | exploit |
| Vendor | Product | Version | |
|---|---|---|---|
| moyangzhan | langchain4j-aideepin |
Affected:
0 , < 3.31.0
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CVE-2026-121937 (GCVE-0-2026-121937)
Vulnerability from cvelistv5 – Published: 2026-11-04 12:31 – Updated: 2026-11-04 18:55- CWE-639 - Authorization Bypass Through User-Controlled Key
| URL | Tags |
|---|---|
| https://github.com/blackholll/loonflow/issues/591 | issue-tracking |
| https://hackmd.io/@hieuPenguinnn/loonflow-ticket-… | third-party-advisory |
| https://github.com/blackholll/loonflow/commit/a64… | patch |
| https://github.com/blackholll/loonflow/blob/r3.2.… | technical-description |
| https://www.vulncheck.com/advisories/loonflow-bef… | third-party-advisory |
| https://hackmd.io/@hieuPenguinnn/cve-2026-121937-… | exploit |
| Vendor | Product | Version | |
|---|---|---|---|
| blackholll | loonflow |
Affected:
0 , < r3.2.3
(custom)
cpe:2.3:a:loonflow_project:loonflow:*:*:*:*:*:*:*:* |
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CVE-2026-121817 (GCVE-0-2026-121817)
Vulnerability from cvelistv5 – Published: 2026-11-04 06:25 – Updated: 2026-11-04 20:00- CWE-639 - Authorization Bypass Through User-Controlled Key
| URL | Tags |
|---|---|
| https://www.twcert.org.tw/en/cp-139-11364-0dce6-2.html | third-party-advisory |
| https://www.twcert.org.tw/tw/cp-132-11366-d92ac-1.html | third-party-advisory |
| Vendor | Product | Version | |
|---|---|---|---|
| About Time Technologies | Herowatch Go Server |
Affected:
all
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CVE-2026-121734 (GCVE-0-2026-121734)
Vulnerability from cvelistv5 – Published: 2026-11-03 22:55 – Updated: 2026-11-03 22:55- CWE-639 - Authorization Bypass Through User-Controlled Key
| URL | Tags |
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| https://github.com/zane-ops/zane-ops/commit/0f3e3… | patch |
| https://github.com/zane-ops/zane-ops | product |
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| https://github.com/zane-ops/zane-ops/blob/v1.15.1… | technical-description |
| https://github.com/zane-ops/zane-ops/releases/tag… | release-notes |
| https://www.vulncheck.com/advisories/zaneops-1.14… | third-party-advisory |
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Mitigation
For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.
Mitigation
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
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.