{"id":"CVE-2026-42861","aliases":["EUVD-2026-35103","GHSA-6fw7-3q8r-m5vj"],"status":"published","title":"Flowise: Mass Assignment in Variable 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 variable update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces. This behavior may break 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":"2026-11-10","score":0.00254,"percentile":0.17103,"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":"2026-05-14T14:52:24Z","modified":"2026-10-28T02:31:02Z","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-6fw7-3q8r-m5vj","tags":["x_refsource_CONFIRM","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-2026-42861","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-6fw7-3q8r-m5vj"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42861.json","tags":["advisory"]},{"url":"https://github.com/FlowiseAI/Flowise","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-42861","title":"Flowise: Mass Assignment in Variable 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 variable update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces. This behavior may break tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:25:47.669Z","modified":"2026-06-09T15:28:06.366Z","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":"2026-11-02T13:40:23.731501Z"}],"euvd":[{"id":"EUVD-2026-35103","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 variable update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces. This behavior may break tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:25:47Z","modified":"2026-06-09T15:28:06Z","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":"2026-11-02T18:20:47.64718Z"}],"ghsa":[{"id":"GHSA-6fw7-3q8r-m5vj","title":"FlowiseAI has Mass Assignment in Variable Update Endpoint that Allows Cross-Workspace Resource Reassignment","description":"### Summary\nA Mass Assignment vulnerability exists in the variable update endpoint of FlowiseAI.\n\nThe endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource.\n\nDue to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces.\n\nThis behavior may break tenant isolation in multi-workspace environments.\n\n### Details\nThe endpoint responsible for updating variables:\n\n**PUT /api/v1/variables/{variableId}**\n\naccepts a JSON request body containing the variable definition.\n\nHowever, the backend does not restrict which attributes can be modified by the client. As a result, user-controlled request bodies can include internal properties that should normally be controlled exclusively by the server.\n\nServer-controlled fields that can be manipulated include:\n\n- workspaceId\n- createdDate\n- updatedDate\n\nThese fields appear to be directly mapped to the database entity without strict input validation or authorization checks.\n\nFor example, the following request body was accepted by the server:\n\n```json\n{\n  \"name\": \"aaa\",\n  \"value\": \"bbbe\",\n  \"type\": \"static\",\n  \"createdDate\": \"2016-03-06T17:59:30.000Z\",\n  \"updatedDate\": \"2016-03-06T18:00:17.000Z\",\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\"\n}\n```\n\nThe server accepted the attacker-controlled workspaceId and metadata fields and persisted them.\n\n### PoC\n**Request**\n\n```http\nPUT /api/v1/variables/\u003cVARIABLE_ID\u003e\nContent-Type: application/json\n\n{\n  \"name\": \"aaa\",\n  \"value\": \"bbbe\",\n  \"type\": \"static\",\n  \"createdDate\": \"2016-03-06T17:59:30.000Z\",\n  \"updatedDate\": \"2016-03-06T18:00:17.000Z\",\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\"\n}\n```\n\n**Response**\n\n```json\n{\n  \"id\": \"0a2b9f61-4a97-4ff8-b80d-00275ed18674\",\n  \"name\": \"aaa\",\n  \"value\": \"bbbe\",\n  \"type\": \"static\",\n  \"createdDate\": \"2016-03-06T17:59:30.000Z\",\n  \"updatedDate\": \"2026-03-06T18:05:17.000Z\",\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\"\n}\n```\n\nThis confirms that the backend accepts and persists attacker-controlled internal properties.\n\n### Impact\nThis vulnerability allows authenticated users to manipulate internal attributes of variable resources.\n\nPossible impacts include:\n\n1. Cross-workspace reassignment of variables (workspaceId)\n2. Unauthorized modification of metadata (createdDate, updatedDate)\n3. Potential tenant isolation bypass in multi-workspace deployments\n\nIn multi-tenant environments, this may allow an attacker to move variables between workspaces without authorization.","status":"published","published":"2026-05-14T14:52:24Z","modified":"2026-06-09T13:09:54Z","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-2026-42861","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 variable update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces. This behavior may break tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T16:16:39.503Z","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-2026-42861","title":"Flowise: Mass Assignment in Variable 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 variable update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces. This behavior may break tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:25:47.669Z","modified":"2026-10-28T02:31:02.64270039Z","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":"2026-11-02T15:45:04.117819Z"},{"id":"GHSA-6fw7-3q8r-m5vj","title":"FlowiseAI has Mass Assignment in Variable Update Endpoint that Allows Cross-Workspace Resource Reassignment","description":"### Summary\nA Mass Assignment vulnerability exists in the variable update endpoint of FlowiseAI.\n\nThe endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource.\n\nDue to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces.\n\nThis behavior may break tenant isolation in multi-workspace environments.\n\n### Details\nThe endpoint responsible for updating variables:\n\n**PUT /api/v1/variables/{variableId}**\n\naccepts a JSON request body containing the variable definition.\n\nHowever, the backend does not restrict which attributes can be modified by the client. As a result, user-controlled request bodies can include internal properties that should normally be controlled exclusively by the server.\n\nServer-controlled fields that can be manipulated include:\n\n- workspaceId\n- createdDate\n- updatedDate\n\nThese fields appear to be directly mapped to the database entity without strict input validation or authorization checks.\n\nFor example, the following request body was accepted by the server:\n\n```json\n{\n  \"name\": \"aaa\",\n  \"value\": \"bbbe\",\n  \"type\": \"static\",\n  \"createdDate\": \"2016-03-06T17:59:30.000Z\",\n  \"updatedDate\": \"2016-03-06T18:00:17.000Z\",\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\"\n}\n```\n\nThe server accepted the attacker-controlled workspaceId and metadata fields and persisted them.\n\n### PoC\n**Request**\n\n```http\nPUT /api/v1/variables/\u003cVARIABLE_ID\u003e\nContent-Type: application/json\n\n{\n  \"name\": \"aaa\",\n  \"value\": \"bbbe\",\n  \"type\": \"static\",\n  \"createdDate\": \"2016-03-06T17:59:30.000Z\",\n  \"updatedDate\": \"2016-03-06T18:00:17.000Z\",\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\"\n}\n```\n\n**Response**\n\n```json\n{\n  \"id\": \"0a2b9f61-4a97-4ff8-b80d-00275ed18674\",\n  \"name\": \"aaa\",\n  \"value\": \"bbbe\",\n  \"type\": \"static\",\n  \"createdDate\": \"2016-03-06T17:59:30.000Z\",\n  \"updatedDate\": \"2026-03-06T18:05:17.000Z\",\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\"\n}\n```\n\nThis confirms that the backend accepts and persists attacker-controlled internal properties.\n\n### Impact\nThis vulnerability allows authenticated users to manipulate internal attributes of variable resources.\n\nPossible impacts include:\n\n1. Cross-workspace reassignment of variables (workspaceId)\n2. Unauthorized modification of metadata (createdDate, updatedDate)\n3. Potential tenant isolation bypass in multi-workspace deployments\n\nIn multi-tenant environments, this may allow an attacker to move variables between workspaces without authorization.","status":"published","published":"2026-05-14T14:52:24Z","modified":"2026-06-09T13:15:14.313771042Z","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":"2026-11-02T15:46:39.618611Z"}]}}