Flowise: RBAC Bypass Leading to Unauthorized Workspace Variables Disclosure

## Finding — Unauthorized Workspace Variables disclosure via $vars injection (bypasses variables:view) ### What’s wrong (code locations) - Variables for the active workspace are fetched without checking “variables:view” at this call site: flowise-src/ packages/components/src/utils.ts:932 - Runtime variables are resolved from server environment variables: flowise-src/packages/components/src/utils.ts:976 - $vars is always injected into the code execution sandbox: flowise-src/packages/components/src/utils.ts:1782 - The official Variables API is permission-protected (contrast): flowise-src/packages/server/src/routes/variables/ index.ts:11 ### Why it is a privilege boundary bypass A user/API key might be denied variables:view (and the /api/v1/variables route enforces it), but they can still: - call /api/v1/node-custom-function (Finding 1) - and have $vars pre-populated with all variables for the workspace, including runtime values from process.env ### What data is exposed Inside the custom JS context, $vars contains a flat map of: - Variable.name -> Variable.value for static variables, and - Variable.name -> process.env[Variable.name] for runtime variables (type === 'runtime') This can expose secrets such as database passwords, JWT secrets, SMTP passwords, cloud keys, etc., depending on what the workspace Variables are configured to map. ### Recommended fix (minimum) - Do not inject $vars unless the caller is authorized: - enforce variables:view before injecting $vars, or - inject only an explicit allowlist of variables needed for the function - Consider disabling or heavily restricting type=runtime variables in self-hosted environments (or restrict which env keys may be mapped).

Source published

4 Aug 2026 17:43:36 UTC

Source modified

4 Aug 2026 18:11:01 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Publisher rating · HIGH