{"id":"CVE-2026-46441","aliases":["EUVD-2026-35109","GHSA-hp26-q66v-q2w7"],"status":"published","title":"Flowise: Mass Assignment in Assistant Update Endpoint Allows Cross-Workspace Resource Reassignment","description":"Flowise is a drag \u0026 drop user interface to build a customized large language model flow. Prior to version 3.1.2, 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. This issue has been patched in version 3.1.2.","severity":{"version":"4.0","score":7.6,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00274,"percentile":0.19899,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-284","CWE-639","CWE-915"],"published":"2026-05-14T14:57:46Z","modified":"2026-10-28T02:31:00Z","fixes":[{"ecosystem":"npm","package":"flowise","fixed_in":["3.1.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"flowise","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.1.1"},{"fixed":"3.1.2"}]}]},{"source":"osv","ecosystem":"npm","package":"flowise","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.2"}]}]}],"products":[{"vendor":"flowiseai","product":"flowise"}],"references":[{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-hp26-q66v-q2w7","tags":["x_refsource_CONFIRM","exploit","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2","tags":["x_refsource_MISC","Product","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46441","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-hp26-q66v-q2w7"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46441.json","tags":["advisory"]},{"url":"https://github.com/FlowiseAI/Flowise","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-46441","title":"Flowise: Mass Assignment in Assistant Update Endpoint Allows Cross-Workspace Resource Reassignment","description":"Flowise is a drag \u0026 drop user interface to build a customized large language model flow. Prior to version 3.1.2, 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. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:30:36.357Z","modified":"2026-06-08T16:28:12.422Z","cvss":[{"version":"4.0","score":7.6,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-284","CWE-639","CWE-915"],"updated_at":"2026-11-02T13:47:06.353366Z"}],"euvd":[{"id":"EUVD-2026-35109","description":"Flowise is a drag \u0026 drop user interface to build a customized large language model flow. Prior to version 3.1.2, 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. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:30:36Z","modified":"2026-06-08T16:28:12Z","cvss":[{"version":"4.0","score":7.6,"vector":"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","level":"high"}],"updated_at":"2026-11-02T18:20:48.834104Z"}],"ghsa":[{"id":"GHSA-hp26-q66v-q2w7","title":"FlowiseAI has Mass Assignment in Assistant Update Endpoint that Allows Cross-Workspace Resource Reassignment","description":"### 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.","status":"published","published":"2026-05-14T14:57:46Z","modified":"2026-06-09T13:10:14Z","cvss":[{"version":"4.0","score":7.6,"vector":"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","level":"high"}],"cwes":["CWE-284","CWE-639","CWE-915"],"updated_at":"2026-11-02T14:40:24.856614Z"}],"nvd":[{"id":"CVE-2026-46441","description":"Flowise is a drag \u0026 drop user interface to build a customized large language model flow. Prior to version 3.1.2, 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. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T16:16:41.19Z","modified":"2026-07-23T07:10:00.113Z","cvss":[{"version":"4.0","score":7.6,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical","assessor":"primary"}],"cwes":["CWE-284","CWE-639","CWE-915"],"updated_at":"2026-11-02T14:12:22.73178Z"}],"osv":[{"id":"CVE-2026-46441","title":"Flowise: Mass Assignment in Assistant Update Endpoint Allows Cross-Workspace Resource Reassignment","description":"Flowise is a drag \u0026 drop user interface to build a customized large language model flow. Prior to version 3.1.2, 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. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:30:36.357Z","modified":"2026-10-28T02:31:00.874463189Z","cvss":[{"version":"4.0","score":7.6,"vector":"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","level":"high"}],"cwes":["CWE-284","CWE-639","CWE-915"],"updated_at":"2026-11-02T15:45:05.870292Z"},{"id":"GHSA-hp26-q66v-q2w7","title":"FlowiseAI has Mass Assignment in Assistant Update Endpoint that Allows Cross-Workspace Resource Reassignment","description":"### 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.","status":"published","published":"2026-05-14T14:57:46Z","modified":"2026-06-09T13:15:15.596860413Z","cvss":[{"version":"4.0","score":7.6,"vector":"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","level":"high"}],"cwes":["CWE-284","CWE-639","CWE-915"],"updated_at":"2026-11-02T15:46:49.28217Z"}]}}