diff --git a/lerna.json b/lerna.json
index afcb33918b..d9d9e01bef 100644
--- a/lerna.json
+++ b/lerna.json
@@ -1,6 +1,6 @@
 {
   "$schema": "node_modules/lerna/schemas/lerna-schema.json",
-  "version": "3.4.9",
+  "version": "3.4.11",
   "npmClient": "yarn",
   "concurrency": 20,
   "command": {
diff --git a/packages/backend-core/src/utils/tests/utils.spec.ts b/packages/backend-core/src/utils/tests/utils.spec.ts
index b5c6283ce2..c7c1e4334f 100644
--- a/packages/backend-core/src/utils/tests/utils.spec.ts
+++ b/packages/backend-core/src/utils/tests/utils.spec.ts
@@ -67,6 +67,15 @@ describe("utils", () => {
       })
     })
 
+    it("gets appId from query params", async () => {
+      const ctx = structures.koa.newContext()
+      const expected = db.generateAppID()
+      ctx.query = { appId: expected }
+
+      const actual = await utils.getAppIdFromCtx(ctx)
+      expect(actual).toBe(expected)
+    })
+
     it("doesn't get appId from url when previewing", async () => {
       const ctx = structures.koa.newContext()
       const appId = db.generateAppID()
diff --git a/packages/backend-core/src/utils/utils.ts b/packages/backend-core/src/utils/utils.ts
index 7f2e25b6d4..fcec61179f 100644
--- a/packages/backend-core/src/utils/utils.ts
+++ b/packages/backend-core/src/utils/utils.ts
@@ -101,6 +101,11 @@ export async function getAppIdFromCtx(ctx: Ctx) {
     appId = confirmAppId(pathId)
   }
 
+  // look in queryParams
+  if (!appId && ctx.query?.appId) {
+    appId = confirmAppId(ctx.query?.appId as string)
+  }
+
   // lookup using custom url - prod apps only
   // filter out the builder preview path which collides with the prod app path
   // to ensure we don't load all apps excessively
diff --git a/packages/server/src/api/routes/backup.ts b/packages/server/src/api/routes/backup.ts
index 94e4cf957f..e94aeb8874 100644
--- a/packages/server/src/api/routes/backup.ts
+++ b/packages/server/src/api/routes/backup.ts
@@ -2,12 +2,14 @@ import Router from "@koa/router"
 import * as controller from "../controllers/backup"
 import authorized from "../../middleware/authorized"
 import { permissions } from "@budibase/backend-core"
+import ensureTenantAppOwnership from "../../middleware/ensureTenantAppOwnership"
 
 const router: Router = new Router()
 
 router.post(
   "/api/backups/export",
   authorized(permissions.BUILDER),
+  ensureTenantAppOwnership,
   controller.exportAppDump
 )
 
diff --git a/packages/server/src/middleware/ensureTenantAppOwnership.ts b/packages/server/src/middleware/ensureTenantAppOwnership.ts
new file mode 100644
index 0000000000..23f35f5cb8
--- /dev/null
+++ b/packages/server/src/middleware/ensureTenantAppOwnership.ts
@@ -0,0 +1,19 @@
+import { tenancy, utils, context } from "@budibase/backend-core"
+import { UserCtx } from "@budibase/types"
+
+async function ensureTenantAppOwnership(ctx: UserCtx, next: any) {
+  const appId = await utils.getAppIdFromCtx(ctx)
+  if (!appId) {
+    ctx.throw(400, "appId must be provided")
+  }
+
+  const appTenantId = context.getTenantIDFromAppID(appId)
+  const tenantId = tenancy.getTenantId()
+
+  if (appTenantId !== tenantId) {
+    ctx.throw(403, "Unauthorized")
+  }
+  await next()
+}
+
+export default ensureTenantAppOwnership
diff --git a/packages/server/src/middleware/tests/ensureTenantAppOwnership.spec.js b/packages/server/src/middleware/tests/ensureTenantAppOwnership.spec.js
new file mode 100644
index 0000000000..5c500f8723
--- /dev/null
+++ b/packages/server/src/middleware/tests/ensureTenantAppOwnership.spec.js
@@ -0,0 +1,75 @@
+import ensureTenantAppOwnership from "../ensureTenantAppOwnership"
+import { tenancy, utils } from "@budibase/backend-core"
+
+jest.mock("@budibase/backend-core", () => ({
+  ...jest.requireActual("@budibase/backend-core"),
+  tenancy: {
+    getTenantId: jest.fn(),
+  },
+  utils: {
+    getAppIdFromCtx: jest.fn(),
+  },
+}))
+
+class TestConfiguration {
+  constructor(appId = "tenant_1") {
+    this.next = jest.fn()
+    this.throw = jest.fn()
+    this.middleware = ensureTenantAppOwnership
+
+    this.ctx = {
+      next: this.next,
+      throw: this.throw,
+    }
+
+    utils.getAppIdFromCtx.mockResolvedValue(appId)
+  }
+
+  async executeMiddleware() {
+    return this.middleware(this.ctx, this.next)
+  }
+
+  afterEach() {
+    jest.clearAllMocks()
+  }
+}
+
+describe("Ensure Tenant Ownership Middleware", () => {
+  let config
+
+  beforeEach(() => {
+    config = new TestConfiguration()
+  })
+
+  afterEach(() => {
+    config.afterEach()
+  })
+
+  it("calls next() when appId matches tenant ID", async () => {
+    tenancy.getTenantId.mockReturnValue("tenant_1")
+
+    await config.executeMiddleware()
+
+    expect(utils.getAppIdFromCtx).toHaveBeenCalledWith(config.ctx)
+    expect(config.next).toHaveBeenCalled()
+  })
+
+  it("throws when tenant appId does not match tenant ID", async () => {
+    const appId = "app_dev_tenant3_fce449c4d75b4e4a9c7a6980d82a3e22"
+    utils.getAppIdFromCtx.mockResolvedValue(appId)
+    tenancy.getTenantId.mockReturnValue("tenant_2")
+
+    await config.executeMiddleware()
+
+    expect(utils.getAppIdFromCtx).toHaveBeenCalledWith(config.ctx)
+    expect(config.throw).toHaveBeenCalledWith(403, "Unauthorized")
+  })
+
+  it("throws 400 when appId is missing", async () => {
+    utils.getAppIdFromCtx.mockResolvedValue(null)
+
+    await config.executeMiddleware()
+
+    expect(config.throw).toHaveBeenCalledWith(400, "appId must be provided")
+  })
+})