GHSA-fcrw-f7gg-6g9f

## Summary The `/api/users/metadata` and `/api/users/metadata/:id` endpoints in `@budibase/server` return full global user profiles to any user with POWER role or above. For SSO-authenticated users (OIDC, Google), the response includes `oauth2.accessToken` and `oauth2.refreshToken` fields, leaking identity provider credentials to other users who should not have access to them. ## Details When a user authenticates via SSO (OIDC or Google), the OAuth2 tokens are stored in the global CouchDB user document at `packages/backend-core/src/auth/auth.ts:170-173`: ```typescript dbUser.oauth2 = { ...dbUser.oauth2, ...details, } await db.put(dbUser) ``` The user metadata endpoints are protected by `PermissionType.USER, PermissionLevel.READ` (`packages/server/src/api/routes/user.ts:11`), which maps to the POWER permission set (`packages/backend-core/src/security/permissions.ts:99`). **Path 1 — List all users** (`GET /api/users/metadata`): 1. `controller.fetchMetadata` → `sdk.users.fetchMetadata()` (`packages/server/src/sdk/users/utils.ts:78`) 2. → `getGlobalUsers()` → `getRawGlobalUsers()` (`packages/server/src/utilities/global.ts:101-122`) — strips only `password` and `forceResetPassword` 3. → `processUser()` (`packages/server/src/utilities/global.ts:15-76`) — strips only `password` and `roles` 4. The `oauth2` field containing `accessToken` and `refreshToken` is **never removed** **Path 2 — Single user** (`GET /api/users/metadata/:id`): 1. `controller.findMetadata` → `getFullUser()` (`packages/server/src/utilities/users.ts:6`) 2. → `getGlobalUser()` → `getRawGlobalUser()` (`packages/server/src/utilities/global.ts:90-92`) — raw CouchDB fetch, **no field stripping at all** 3. → `processUser()` — strips only `password` and `roles` 4. Same result: `oauth2` tokens are returned There is no output sanitization middleware on these routes that would strip sensitive fields before the response reaches the client. ## PoC **Prerequisites:** A Budibase instance with at least on