{"id":"CVE-2026-42862","aliases":["EUVD-2026-35104","GHSA-x5v6-pj28-cwwm"],"status":"published","title":"Flowise: Mass Assignment in Tool 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 tool update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools 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":"2026-11-10","score":0.00195,"percentile":0.09271,"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":"2026-05-14T14:52:40Z","modified":"2026-10-28T02:30:58Z","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-x5v6-pj28-cwwm","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-2026-42862","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-x5v6-pj28-cwwm"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42862.json","tags":["advisory"]},{"url":"https://github.com/FlowiseAI/Flowise","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-42862","title":"Flowise: Mass Assignment in Tool 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 tool update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:25:59.588Z","modified":"2026-06-08T15:51:47.01Z","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-2026-35104","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 tool update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:25:59Z","modified":"2026-06-08T15:51:47Z","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":"2026-11-02T18:20:49.297547Z"}],"ghsa":[{"id":"GHSA-x5v6-pj28-cwwm","title":"FlowiseAI has Mass Assignment in Tool Update Endpoint that Allows Cross-Workspace Resource Reassignment","description":"### Summary\nA Mass Assignment vulnerability exists in the tool update endpoint of FlowiseAI.\n\nThe endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource.\n\nDue to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments.\n\n### Details\nThe endpoint responsible for updating tools:\n\n**PUT /api/v1/tools/{toolId}**\n\naccepts a JSON request body containing tool 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\nThe request body is directly merged into the underlying database entity without proper DTO validation or authorization checks.\n\n### PoC\nAuthenticate to the Flowise interface.\n\nCapture the request used to update a tool:\n\n```http\nPUT /api/v1/tools/\u003cTOOL_ID\u003e\nContent-Type: application/json\n\nModify the request body by injecting additional fields:\n\n{\n  \"name\": \"aaa\",\n  \"description\": \"bbb\",\n  \"color\": \"linear-gradient(rgb(109,215,45), rgb(136,170,134))\",\n  \"schema\": \"[]\",\n  \"func\": \"\",\n  \"iconSrc\": \"test\",\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\",\n  \"createdDate\": \"1995-03-06T14:17:50.000Z\",\n  \"updatedDate\": \"1995-03-06T14:17:50.000Z\"\n}\n\n```\nSend the request.\n\nObserve that the response includes the manipulated fields:\n\n```json\n{\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\",\n  \"createdDate\": \"1995-03-06T14:17:50.000Z\"\n}\n```\n\nThis confirms that client-controlled values are accepted and persisted by the server.\n\n### Impact\nThis vulnerability allows authenticated users to manipulate internal attributes of tool resources.\n\nConfirmed impacts include:\n\n- Cross-workspace reassignment of tools (workspaceId)\n- Unauthorized modification of metadata (createdDate, updatedDate)\n\nIn multi-tenant deployments, this may allow an attacker to move tools between workspaces without authorization, breaking tenant isolation boundaries.","status":"published","published":"2026-05-14T14:52:40Z","modified":"2026-06-09T13:09:58Z","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-2026-42862","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 tool update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T16:16:39.677Z","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":5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-284","CWE-639","CWE-915"],"updated_at":"2026-11-02T14:12:22.73178Z"}],"osv":[{"id":"CVE-2026-42862","title":"Flowise: Mass Assignment in Tool 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 tool update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.","status":"published","published":"2026-06-08T15:25:59.588Z","modified":"2026-10-28T02:30:58.108978115Z","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-x5v6-pj28-cwwm","title":"FlowiseAI has Mass Assignment in Tool Update Endpoint that Allows Cross-Workspace Resource Reassignment","description":"### Summary\nA Mass Assignment vulnerability exists in the tool update endpoint of FlowiseAI.\n\nThe endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource.\n\nDue to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments.\n\n### Details\nThe endpoint responsible for updating tools:\n\n**PUT /api/v1/tools/{toolId}**\n\naccepts a JSON request body containing tool 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\nThe request body is directly merged into the underlying database entity without proper DTO validation or authorization checks.\n\n### PoC\nAuthenticate to the Flowise interface.\n\nCapture the request used to update a tool:\n\n```http\nPUT /api/v1/tools/\u003cTOOL_ID\u003e\nContent-Type: application/json\n\nModify the request body by injecting additional fields:\n\n{\n  \"name\": \"aaa\",\n  \"description\": \"bbb\",\n  \"color\": \"linear-gradient(rgb(109,215,45), rgb(136,170,134))\",\n  \"schema\": \"[]\",\n  \"func\": \"\",\n  \"iconSrc\": \"test\",\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\",\n  \"createdDate\": \"1995-03-06T14:17:50.000Z\",\n  \"updatedDate\": \"1995-03-06T14:17:50.000Z\"\n}\n\n```\nSend the request.\n\nObserve that the response includes the manipulated fields:\n\n```json\n{\n  \"workspaceId\": \"11111111-2222-3333-4444-555555555555\",\n  \"createdDate\": \"1995-03-06T14:17:50.000Z\"\n}\n```\n\nThis confirms that client-controlled values are accepted and persisted by the server.\n\n### Impact\nThis vulnerability allows authenticated users to manipulate internal attributes of tool resources.\n\nConfirmed impacts include:\n\n- Cross-workspace reassignment of tools (workspaceId)\n- Unauthorized modification of metadata (createdDate, updatedDate)\n\nIn multi-tenant deployments, this may allow an attacker to move tools between workspaces without authorization, breaking tenant isolation boundaries.","status":"published","published":"2026-05-14T14:52:40Z","modified":"2026-06-09T13:15:15.860906508Z","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":"2026-11-02T15:46:59.484835Z"}]}}