GHSA-HP26-Q66V-Q2W7
Vulnerability from github – Published: 2026-05-14 14:57 – Updated: 2026-05-14 20:55Summary
A Mass Assignment vulnerability exists in the assistant update endpoint of FlowiseAI.
The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating an assistant resource.
Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign assistants to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments.
Details
The endpoint responsible for updating assistants:
PUT /api/v1/assistants/{assistantId}
accepts a JSON request body containing assistant metadata.
However, the server does not restrict which properties may be modified by the client. As a result, user-controlled request bodies can include additional fields that should normally be controlled only by the backend.
Server-controlled fields that can be manipulated include:
- workspaceId
- createdDate
- updatedDate
These fields appear to be directly mapped to the underlying database entity without strict DTO whitelisting or authorization checks.
For example, the following request body was accepted:
{
"details": "",
"credential": "11ca7fef-c9b1-4c87-aa54-e547aed8a249",
"iconSrc": null,
"type": "CUSTOM",
"createdDate": "2026-03-06T17:31:04.000Z",
"updatedDate": "2026-03-06T17:31:55.000Z",
"workspaceId": "11111111-2222-3333-4444-555555555555"
}
This indicates that internal, server-controlled properties can be modified by an authenticated user.
PoC
- Authenticate to the Flowise interface.
- Capture the request used to update an assistant:
PUT /api/v1/assistants/<ASSISTANT_ID>
Content-Type: application/json
Modify the request body by injecting server-controlled fields:
{
"details": "",
"credential": "11ca7fef-c9b1-4c87-aa54-e547aed8a249",
"iconSrc": null,
"type": "CUSTOM",
"createdDate": "2026-03-06T17:31:04.000Z",
"updatedDate": "2026-03-06T17:31:55.000Z",
"workspaceId": "11111111-2222-3333-4444-555555555555"
}
3.Send the request.
Observe that the response accepts and persists the attacker-controlled workspaceId and metadata fields.
Impact
This vulnerability allows authenticated users to manipulate internal attributes of assistant resources.
Confirmed impacts include:
- Cross-workspace reassignment of assistants (workspaceId)
- Unauthorized modification of metadata (createdDate, updatedDate)
In multi-tenant deployments, this may allow an attacker to move assistants between workspaces without authorization, breaking tenant isolation boundaries.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 3.1.1"
},
"package": {
"ecosystem": "npm",
"name": "flowise"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.1.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-46441"
],
"database_specific": {
"cwe_ids": [
"CWE-284",
"CWE-639",
"CWE-915"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-14T14:57:46Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Summary\nA Mass Assignment vulnerability exists in the assistant update endpoint of FlowiseAI.\n\nThe endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating an assistant resource.\n\nDue to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign assistants to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments.\n\n### Details\nThe endpoint responsible for updating assistants:\n\n**PUT /api/v1/assistants/{assistantId}**\n\naccepts a JSON request body containing assistant metadata.\n\nHowever, the server does not restrict which properties may be modified by the client. As a result, user-controlled request bodies can include additional fields that should normally be controlled only by the backend.\n\nServer-controlled fields that can be manipulated include:\n\n1. workspaceId\n2. createdDate\n3. updatedDate\n\nThese fields appear to be directly mapped to the underlying database entity without strict DTO whitelisting or authorization checks.\n\nFor example, the following request body was accepted:\n\n```json\n{\n \"details\": \"\",\n \"credential\": \"11ca7fef-c9b1-4c87-aa54-e547aed8a249\",\n \"iconSrc\": null,\n \"type\": \"CUSTOM\",\n \"createdDate\": \"2026-03-06T17:31:04.000Z\",\n \"updatedDate\": \"2026-03-06T17:31:55.000Z\",\n \"workspaceId\": \"11111111-2222-3333-4444-555555555555\"\n}\n```\n\nThis indicates that internal, server-controlled properties can be modified by an authenticated user.\n\n### PoC\n\n1. Authenticate to the Flowise interface.\n2. Capture the request used to update an assistant:\n\n```http\nPUT /api/v1/assistants/\u003cASSISTANT_ID\u003e\nContent-Type: application/json\n\nModify the request body by injecting server-controlled fields:\n\n{\n \"details\": \"\",\n \"credential\": \"11ca7fef-c9b1-4c87-aa54-e547aed8a249\",\n \"iconSrc\": null,\n \"type\": \"CUSTOM\",\n \"createdDate\": \"2026-03-06T17:31:04.000Z\",\n \"updatedDate\": \"2026-03-06T17:31:55.000Z\",\n \"workspaceId\": \"11111111-2222-3333-4444-555555555555\"\n}\n\n```\n3.Send the request.\n\nObserve that the response accepts and persists the attacker-controlled workspaceId and metadata fields.\n\n### Impact\nThis vulnerability allows authenticated users to manipulate internal attributes of assistant resources.\n\nConfirmed impacts include:\n\n- Cross-workspace reassignment of assistants (workspaceId)\n- Unauthorized modification of metadata (createdDate, updatedDate)\n\nIn multi-tenant deployments, this may allow an attacker to move assistants between workspaces without authorization, breaking tenant isolation boundaries.",
"id": "GHSA-hp26-q66v-q2w7",
"modified": "2026-05-14T20:55:07Z",
"published": "2026-05-14T14:57:46Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-hp26-q66v-q2w7"
},
{
"type": "PACKAGE",
"url": "https://github.com/FlowiseAI/Flowise"
},
{
"type": "WEB",
"url": "https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "FlowiseAI has Mass Assignment in Assistant Update Endpoint that Allows Cross-Workspace Resource Reassignment"
}
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.