Budibase: Unauthenticated Remote Code Execution via Webhook Trigger and Bash Automation Step

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.0 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

• CVE-2026-35216: 10.90% estimated exploitation activity in the next 30 days; percentile 95.88 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary An unauthenticated attacker can achieve Remote Code Execution (RCE) on the Budibase server by triggering an automation that contains a Bash step via the public webhook endpoint. No authentication is required to trigger the exploit. The process executes as root inside the container. Details Vulnerable endpoint — packages/server/src/api/routes/webhook.ts line 13: The webhook trigger endpoint is registered on publicRoutes with no authentication middleware. Any unauthenticated HTTP client can POST to this endpoint. Vulnerable sink — packages/server/src/automations/steps/bash.ts lines 21–26: The Bash automation step uses Handlebars template processing (processStringSync) on inputs.code, substituting values from the webhook request body into the shell command string before passing it to execSync(). Attack chain: Precondition: An admin must have created and published an automation containing: 1. A Webhook trigger 2. A Bash step whose code field uses a trigger field template (e.g.,…

Published by the source

4 Apr 2026, 06:04 UTC

Last modified by the source

4 Apr 2026, 06:26 UTC

Source last checked

26 Oct 2026, 12:47 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-fcm4-4pj2-m5hf

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-fcm4-4pj2-m5hf

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-fcm4-4pj2-m5hf

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# Patch Next advisory brief: CVE-2026-35216

Advisory: Budibase: Unauthenticated Remote Code Execution via Webhook Trigger and Bash Automation Step
IDs: CVE-2026-35216, GHSA-fcm4-4pj2-m5hf
Record: https://patchnext.com/advisories/cve-2026-35216 (revision 3, source checked 26 Oct 2026, 12:47 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @budibase/server 3.33.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @budibase/server: affected < 3.33.4; fixed in 3.33.4

## Suggested inspection (read-only)
- `npm ls @budibase/server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @budibase/server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-fcm4-4pj2-m5hf (GitHub-reviewed advisory GHSA-fcm4-4pj2-m5hf lists affected ranges: npm @budibase/server >=0 <3.33.4)
- Verified: https://osv.dev/vulnerability/GHSA-fcm4-4pj2-m5hf (OSV record GHSA-fcm4-4pj2-m5hf lists affected ranges: npm @budibase/server >=0 <3.33.4 (fixed))

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