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EUVD-2026-331107

fkie_cve-2026-54351

Budibase is an open-source low-code platform. Prior to 3.39.9, the webhook trigger endpoint in Budibase is publicly accessible and passes the full HTTP request body into automation execution parameters. A mass assignment vulnerability in externalTrigger() allows an attacker to overwrite the internal appId property by including it in the webhook POST body. When the automation is processed asynchronously (the default path for webhooks without a collect step), the worker executes the attacker-defined automation in the context of the victim's workspace, granting full read/write access to the victim's database. This vulnerability is fixed in 3.39.9.

GHSA-rgvg-3wpc-h44p — Budibase: Mass Assignment in Webhook Trigger Allows Cross-Workspace Automation Execution via appId Override

Affected: npm: @budibase/server

## Summary

The webhook trigger endpoint in Budibase is publicly accessible and passes the full HTTP request body into automation execution parameters. A mass assignment vulnerability in `externalTrigger()` allows an attacker to overwrite the internal `appId` property by including it in the webhook POST body. When the automation is processed asynchronously (the default path for webhooks without a collect step), the worker executes the attacker-defined automation in the context of the victim's workspace, granting full read/write access to the victim's database.

## Details

The webhook trigger route is registered as a public endpoint with no authentication:

```typescript // packages/server/src/api/routes/webhook.ts:12 publicRoutes.post("/api/webhooks/trigger/:instance/:id", controller.trigger) ```

The controller passes the raw request body as `fields` alongside the server-derived `appId`:

```typescript // packages/server/src/api/controllers/webhook.ts:142-148 await triggers.externalTrigger(target, { fields: { ...ctx.request.body, // attacker-controlled body: ctx.request.body, }, appId: prodAppId, // server-controlled }) ```

In `externalTrigger()`, for webhook-triggered automations, `params.fields` is spread back into `params`:

```typescript // packages/server/src/automations/triggers.ts:237-241 params = { ...params, // appId: prodAppId (server-controlled) ...params.fields, // appId: VICTIM_ID (attacker-controlled, overwrites above) f…

WID-SEC-W-2026-1806 — Budibase: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Budibase ausnutzen, um Sicherheitsvorkehrungen zu umgehen, und um Dateien zu manipulieren.