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.
CVE-2026-4503 (GCVE-0-2026-4503)
Vulnerability from cvelistv5 – Published: 2026-04-30 20:48 – Updated: 2026-05-01 19:30
VLAI
Title
Unauthenticated Insecure Direct Object Reference (IDOR) Vulnerability in Langflow Desktop Image Download Endpoint
Summary
IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow could allow an unauthenticated user to view other users' images due to an indirect object reference through a user-controlled key.
Severity
7.5 (High)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7271099 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Langflow Desktop |
Affected:
1.0.0 , ≤ 1.8.4
(semver)
cpe:2.3:a:ibm:langflow_desktop:1.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:langflow_desktop:1.8.4:*:*:*:*:*:*:* |
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CVE-2026-45297 (GCVE-0-2026-45297)
Vulnerability from cvelistv5 – Published: 2026-05-28 16:50 – Updated: 2026-05-28 16:50
VLAI
Title
Cross-tenant IDOR on feature-flag and assist-stats routes via {project_id} case mismatch
Summary
OpenReplay is a self-hosted session replay suite. Prior to 1.26.0, there is a cross-tenant IDOR on feature-flag and assist-stats routes via {project_id} case mismatch. ProjectAuthorizer.__call__ (OSS api/auth/auth_project.py:14-38 and EE ee/api/auth/auth_project.py:14-46) only runs projects.is_authorized(project_id, tenant_id, user_id) + projects.get_project(tenant_id, project_id) when self.project_identifier == "projectId" (camelCase). For EE multi-tenant, feature-flag queries only filter on project_id, never tenant_id. Any authenticated user in tenant A can read/update/delete feature-flag rows belonging to tenant B by iterating the sequential integer project_id + feature_flag_id. OSS is single-tenant by design ({"errors":["tenants already registered"]} on second signup) so there's no cross-tenant impact This vulnerability is fixed in 1.26.0.
Severity
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/openreplay/openreplay/security… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| openreplay | openreplay |
Affected:
< 1.26.0
|
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CVE-2026-45349 (GCVE-0-2026-45349)
Vulnerability from cvelistv5 – Published: 2026-05-15 19:20 – Updated: 2026-05-19 12:41
VLAI
Title
Open WebUI: Broken Access Control for Completions API
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, a user just needs to use the API endpoint: /api/chat/completions with their own API key (generated in OWUI) and the Chat ID of another user to continue the conversation of the other user. This vulnerability is fixed in 0.9.0.
Severity
7.1 (High)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
< 0.9.0
|
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CVE-2026-45385 (GCVE-0-2026-45385)
Vulnerability from cvelistv5 – Published: 2026-05-15 20:29 – Updated: 2026-05-18 15:56
VLAI
Title
Open WebUI: An IDOR vulnerability exists in the update_message_by_id API endpoint
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, an IDOR vulnerability exists in the Channels feature of Open WebUI, allowing any channel member to modify messages sent by other members (including administrators) within the same channel. In the update_message_by_id function, for group or dm type channels, only the caller's membership in the channel is checked via the is_user_channel_member function, without verifying message ownership. This allows any channel member to modify messages sent by other members within the same channel. This vulnerability is fixed in 0.9.5.
Severity
4.3 (Medium)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
< 0.9.5
|
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CVE-2026-45386 (GCVE-0-2026-45386)
Vulnerability from cvelistv5 – Published: 2026-05-15 20:36 – Updated: 2026-05-19 12:32
VLAI
Title
Open WebUI: An IDOR vulnerability exists in the pin_channel_message API endpoint
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, Pin/Unpin is a write operation (modifies the message's is_pinned , pinned_by, pinned_at fields), but in standard channels it only checks read permission, allowing users with read-only access to pin/unpin any message. This vulnerability is fixed in 0.9.5.
Severity
4.3 (Medium)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
< 0.9.5
|
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CVE-2026-45398 (GCVE-0-2026-45398)
Vulnerability from cvelistv5 – Published: 2026-05-15 20:35 – Updated: 2026-05-19 03:55
VLAI
Title
Open WebUI: IDOR - Retrieval API Bypasses Knowledge Base Access Controls
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, _validate_collection_access() checks the user-memory-* and file-* collection name prefixes but does not check knowledge base collections, which use raw UUIDs as collection names. Any authenticated user who knows a private knowledge base UUID can read its content through the retrieval query endpoints, even though the knowledge API correctly denies that user access. The same gap affects the retrieval write endpoints (/process/text, /process/file, /process/files/batch, /process/web, /process/youtube), allowing an attacker to inject content into or overwrite another user's knowledge base. This vulnerability is fixed in 0.9.5.
Severity
7.5 (High)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
| https://github.com/open-webui/open-webui/pull/22109 | 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
|
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CVE-2026-45402 (GCVE-0-2026-45402)
Vulnerability from cvelistv5 – Published: 2026-05-15 20:40 – Updated: 2026-05-19 03:55
VLAI
Title
Open WebUI: Cross-User File Access via Unchecked file_id in Folder Knowledge and Knowledge-Base Attach Endpoints
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, multiple endpoints accept a user-supplied file_id and attach the referenced file to a resource the caller controls (folder knowledge, knowledge-base contents) without verifying that the caller owns or has been granted access to the file. The file's content then becomes reachable through the downstream RAG / file-content paths, allowing any authenticated user to exfiltrate any other user's private file — and on the knowledge-base path, also to overwrite it — given knowledge of the file's UUID. This affects backend/open_webui/routers/folders.py (POST /api/v1/folders/{id}/update), backend/open_webui/routers/knowledge.py (add_file_to_knowledge_by_id), and backend/open_webui/routers/knowledge.py (add_files_to_knowledge_by_id_batch). This vulnerability is fixed in 0.9.5.
Severity
8.1 (High)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
< 0.9.5
|
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CVE-2026-4549 (GCVE-0-2026-4549)
Vulnerability from cvelistv5 – Published: 2026-03-22 13:47 – Updated: 2026-03-25 13:45
VLAI
Title
mickasmt next-saas-stripe-starter Stripe API open-customer-portal.ts openCustomerPortal authorization
Summary
A flaw has been found in mickasmt next-saas-stripe-starter 1.0.0. Affected by this issue is the function openCustomerPortal of the file actions/open-customer-portal.ts of the component Stripe API. This manipulation causes authorization bypass. Remote exploitation of the attack is possible. The complexity of an attack is rather high. The exploitation is known to be difficult.
Severity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.352376 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.352376 | signaturepermissions-required |
| https://vuldb.com/?submit.774806 | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| mickasmt | next-saas-stripe-starter |
Affected:
1.0.0
|
Credits
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CVE-2026-4563 (GCVE-0-2026-4563)
Vulnerability from cvelistv5 – Published: 2026-03-22 23:51 – Updated: 2026-03-25 13:53
VLAI
Title
MacCMS Member Order Detail User.php order_info authorization
Summary
A weakness has been identified in MacCMS up to 2025.1000.4052. This vulnerability affects the function order_info of the file application/index/controller/User.php of the component Member Order Detail Interface. This manipulation of the argument order_id causes authorization bypass. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks.
Severity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.352400 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.352400 | signaturepermissions-required |
| https://vuldb.com/?submit.775050 | third-party-advisory |
| https://github.com/HuajiHD/CVE/issues/10 | exploitissue-tracking |
Impacted products
Credits
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{
"name": "VDB-352400 | MacCMS Member Order Detail User.php order_info authorization",
"tags": [
"vdb-entry",
"technical-description"
],
"url": "https://vuldb.com/?id.352400"
},
{
"name": "VDB-352400 | CTI Indicators (IOB, IOC, IOA)",
"tags": [
"signature",
"permissions-required"
],
"url": "https://vuldb.com/?ctiid.352400"
},
{
"name": "Submit #775050 | MacCMS 2025.1000.4052 Authorization Bypass",
"tags": [
"third-party-advisory"
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"url": "https://vuldb.com/?submit.775050"
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"value": "VulDB entry created"
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CVE-2026-45666 (GCVE-0-2026-45666)
Vulnerability from cvelistv5 – Published: 2026-05-15 21:07 – Updated: 2026-05-18 16:15
VLAI
Title
Open WebUI: Indirect Object Reference (IDOR) in user notes
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, the API /api/v1/notes/{note_id} endpoint lacks proper authorization checks, allowing authenticated users to retrieve notes belonging to other users by guessing or enumerating UUIDs. This results in unauthorized disclosure of potentially sensitive or private user data. This vulnerability is fixed in 0.8.11.
Severity
6.5 (Medium)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
< 0.8.11
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-45666",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-18T16:14:44.070898Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-18T16:15:07.445Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "open-webui",
"vendor": "open-webui",
"versions": [
{
"status": "affected",
"version": "\u003c 0.8.11"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, the API /api/v1/notes/{note_id} endpoint lacks proper authorization checks, allowing authenticated users to retrieve notes belonging to other users by guessing or enumerating UUIDs. This results in unauthorized disclosure of potentially sensitive or private user data. This vulnerability is fixed in 0.8.11."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-639",
"description": "CWE-639: Authorization Bypass Through User-Controlled Key",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-15T21:07:42.714Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h"
}
],
"source": {
"advisory": "GHSA-x3qm-p8hr-3c3h",
"discovery": "UNKNOWN"
},
"title": "Open WebUI: Indirect Object Reference (IDOR) in user notes"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-45666",
"datePublished": "2026-05-15T21:07:42.714Z",
"dateReserved": "2026-05-12T21:59:25.665Z",
"dateUpdated": "2026-05-18T16:15:07.445Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation
Phase: Architecture and Design
Description:
- For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.
Mitigation
Phases: Architecture and Design, Implementation
Description:
- 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
Phase: Architecture and Design
Description:
- 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.