Common Weakness Enumeration
CWE-639
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.
4780 vulnerabilities reference this CWE, most recent first.
CVE-2026-88877 (GCVE-0-2026-88877)
Vulnerability from cvelistv5 – Published: 2026-09-10 13:05 – Updated: 2026-10-08 15:51
VLAI
EPSS
VEX
Title
Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
Summary
Traefik is a HTTP reverse proxy and load balancer. In versions >= v3.7.0 and <= v3.7.11, the Kubernetes ingress-nginx provider mishandles Ingresses that carry both an authentication annotation and the nginx.ingress.kubernetes.io/from-to-www-redirect annotation. For such Ingresses the provider creates an additional 'sibling' router that matches on the host alone, carries only the RedirectRegex middleware, and still points at the parent router's protected backend service. Because RedirectRegex is not a terminal handler, a request its pattern does not match is forwarded to the backend, and because the redirect pattern only accepts a numeric port while Traefik's host matcher canonicalizes the authority via net.SplitHostPort, a request with a non-numeric or empty port (for example 'Host: www.example.com:x') selects the sibling router, misses the redirect, and is proxied to the protected backend with none of the Ingress's annotation-derived middlewares applied. This discards not only authentication (e.g. BasicAuth) but every annotation-derived middleware, including source-IP allowlisting. Traefik v2 and v3 releases before v3.7.0 are not affected. The issue is fixed in v3.7.12.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 14:09 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/traefik-3.7.… | third-party-advisory |
Impacted products
Date Public
2026-08-27 00:00
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CVE-2026-88865 (GCVE-0-2026-88865)
Vulnerability from cvelistv5 – Published: 2026-09-10 13:05 – Updated: 2026-09-18 17:23
VLAI
EPSS
VEX
Title
AVideo Missing Authorization via getRestream.json.php
Summary
AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 fails to validate restream ownership in getRestream.json.php, allowing authenticated users with canStream permission to mint tokens for arbitrary restreams. Attackers can exchange the token to retrieve other users' stream keys from getLiveKey.json.php and publish to their YouTube, Twitch, or RTMP destinations.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:10 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/WWBN/AVideo/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/avideo-missi… | third-party-advisory |
Impacted products
Date Public
2026-08-27 00:00
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CVE-2026-88065 (GCVE-0-2026-88065)
Vulnerability from cvelistv5 – Published: 2026-09-15 20:20 – Updated: 2026-09-16 13:58
VLAI
EPSS
VEX
Title
`tts-be` application has a Broken Access Control vulnerability
Summary
`tts-be` is a backend for a timetable selector that aims to help students better choose their class schedules. Versions prior to 2.1.0 have a Broken Access Control vulnerability across several API endpoints (such as `/api/student/{id}/photo` and `/api/course_unit/{id}/exchange/metadata`). By chaining these unauthenticated endpoints, a remote attacker can use the backend as an open proxy to bypass authorization checks, allowing for the enumeration and extraction of sensitive Personally Identifiable Information (PII) from upstream university systems. The exposed data includes full names, student IDs, class schedules, and photos. This issue was fixed in version 2.1.0.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 13:58 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/NIAEFEUP/tts-be/security/advis… | x_refsource_CONFIRM |
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CVE-2026-87997 (GCVE-0-2026-87997)
Vulnerability from cvelistv5 – Published: 2026-09-09 21:30 – Updated: 2026-09-14 13:44
VLAI
EPSS
VEX
Title
Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, POST /api/chat/completions and POST /api/v1/chat/completions in backend/open_webui/main.py copied a client-supplied folder_id into a new chat without applying the folder write-access check used by the dedicated chat routes. An authenticated user who knew a shared folder identifier could inject an attacker-controlled chat into a folder where the user had read-only or no write access, causing the entry to appear to authorized folder readers. This issue is fixed in version 0.11.1.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:43 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
| https://github.com/open-webui/open-webui/pull/28366 | x_refsource_MISC |
| https://github.com/open-webui/open-webui/commit/d… | x_refsource_MISC |
| https://github.com/open-webui/open-webui/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
>= 0.10.0, < 0.11.1
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CVE-2026-87994 (GCVE-0-2026-87994)
Vulnerability from cvelistv5 – Published: 2026-09-09 21:24 – Updated: 2026-09-10 15:59
VLAI
EPSS
VEX
Title
Open WebUI: Channel members can overwrite another member's message via the chat completions endpoint
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 until 0.11.1, the channel branch of chat_completion in backend/open_webui/main.py checked channel write access and channel membership for a supplied message_id but did not verify that the calling user authored the targeted message. A channel member could use the chat completions endpoint to replace another member's message while preserving the victim as the stored author, altering the conversation record without gaining access to other channels. This issue is fixed in version 0.11.1.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 15:59 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
| https://github.com/open-webui/open-webui/pull/28631 | x_refsource_MISC |
| https://github.com/open-webui/open-webui/commit/7… | x_refsource_MISC |
| https://github.com/open-webui/open-webui/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
>= 0.9.5, < 0.11.1
|
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CVE-2026-87975 (GCVE-0-2026-87975)
Vulnerability from cvelistv5 – Published: 2026-10-06 13:35 – Updated: 2026-10-06 13:53
VLAI
EPSS
VEX
Title
Privilege abuse in model formsets with editable primary keys
Summary
An issue was discovered in Django 6.1 before 6.1.2, 6.0 before 6.0.9, and 5.2 before 5.2.18.
`django.forms.models.BaseModelFormSet.save_existing_objects()` used the presence of a primary key on a submitted form's instance as evidence that the instance belonged to the formset's limiting queryset. An object outside that queryset is represented by a newly constructed instance whose primary key can still be populated from submitted data when the model's primary key is a field accepted by the form, such as a `OneToOneField` or parent link used as the primary key of an inline formset's model, or a natural or UUID primary key included in the form's fields. This allows an authenticated user permitted to submit such a formset to delete rows outside the limiting queryset, without any permission on the targeted object, via forged management-form data marking an out-of-queryset object for deletion. Models using the default AutoField primary key are not affected.
Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected.
Django would like to thank Seonggwon Yoon for reporting this issue.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 13:51 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
7 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| djangoproject | Django |
Affected:
6.1 , < 6.1.2
(python)
Unaffected: 6.1.2 (python) Affected: 6.0 , < 6.0.9 (python) Unaffected: 6.0.9 (python) Affected: 5.2 , < 5.2.18 (python) Unaffected: 5.2.18 (python) |
Date Public
2026-10-06 08:00
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CVE-2026-87829 (GCVE-0-2026-87829)
Vulnerability from cvelistv5 – Published: 2026-09-17 07:54 – Updated: 2026-09-17 12:09
VLAI
EPSS
VEX
Title
Checkout Field Manager < 7.9.7 - Subscriber+ Arbitrary Attachment Deletion via Unvalidated Attachment ID Reparenting
Summary
The Checkout Field Manager (Checkout Manager) for WooCommerce WordPress plugin before 7.9.7 does not properly validate the ownership of an attachment before deleting it, allowing any authenticated user such as a customer to delete arbitrary media attachments belonging to other users.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 12:09 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://wpscan.com/vulnerability/8c76bf99-5d3e-45… | exploitvdb-entrytechnical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Unknown | Checkout Field Manager (Checkout Manager) for WooCommerce |
Affected:
7.8.6 , < 7.9.7
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CVE-2026-87809 (GCVE-0-2026-87809)
Vulnerability from cvelistv5 – Published: 2026-09-09 11:20 – Updated: 2026-09-18 17:23
VLAI
EPSS
VEX
Title
Siyuan before v3.8.2 Information Disclosure via Export Preview
Summary
Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints. Attackers with reader access can retrieve the full rendered content of private, hidden, or publish-disabled blocks by accessing public documents containing embed queries that select those blocks.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:08 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/siyuan-note/siyuan/security/ad… | vendor-advisory |
| https://www.vulncheck.com/advisories/siyuan-befor… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| siyuan-note | siyuan |
Affected:
0 , < 3.8.2
(semver)
Unaffected: 3.8.2 (semver) cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* |
Date Public
2026-08-26 00:00
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CVE-2026-87739 (GCVE-0-2026-87739)
Vulnerability from cvelistv5 – Published: 2026-09-24 06:46 – Updated: 2026-09-24 12:42
VLAI
EPSS
VEX
Title
PaperCut MF/NG: User permissions are not evaluated on report generation
Summary
An improper authentication vulnerability in PaperCut MF/NG allows an unauthenticated, remote attacker to trigger report generation. By submitting report generation requests without valid credentials, an attacker can generate reports and gain unauthorized access to sensitive information.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 12:42 UTC
CWE
- CWE-639 - Authorization bypass through User-Controlled key
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| PaperCut | PaperCut NG/MF |
Affected:
0 , < 25.0.13
(semver)
Affected: 26.0.0 , < 26.0.5 (semver) |
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CVE-2026-87113 (GCVE-0-2026-87113)
Vulnerability from cvelistv5 – Published: 2026-09-16 19:42 – Updated: 2026-09-17 16:09
VLAI
EPSS
VEX
Title
Tanium addressed an improper access controls vulnerability in Threat Response.
Summary
Tanium addressed an improper access controls vulnerability in Threat Response.
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 16:09 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Tanium | Threat Response |
Affected:
4.9 , < 4.9.449
(custom)
Affected: 4.12 , < 4.12.319 (custom) Affected: 4.17 , < 4.17.291 (custom) |
Date Public
2026-09-16 19:42
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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.