{"id":"GHSA-x5v6-pj28-cwwm","summary":"FlowiseAI has Mass Assignment in Tool Update Endpoint that Allows Cross-Workspace Resource Reassignment","details":"### 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.","aliases":["CVE-2026-42862"],"modified":"2026-06-09T13:15:15.860906508Z","published":"2026-05-14T14:52:40Z","database_specific":{"nvd_published_at":"2026-06-08T16:16:39Z","cwe_ids":["CWE-284","CWE-639","CWE-915"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-05-14T14:52:40Z"},"references":[{"type":"WEB","url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-x5v6-pj28-cwwm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42862"},{"type":"PACKAGE","url":"https://github.com/FlowiseAI/Flowise"},{"type":"WEB","url":"https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2"}],"affected":[{"package":{"name":"flowise","ecosystem":"npm","purl":"pkg:npm/flowise"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.2"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 3.1.1","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-x5v6-pj28-cwwm/GHSA-x5v6-pj28-cwwm.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}