Budibase: Remote Code Execution via Unsafe eval() in View Filter Map Function (Budibase Cloud)

Exploitation

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

CVSS

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

EPSS

• CVE-2026-27702: 0.39% estimated exploitation activity in the next 30 days; percentile 33.25 (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 A critical unsafe eval() vulnerability in Budibase's view filtering implementation allows any authenticated user (including free tier accounts) to execute arbitrary JavaScript code on the server. This vulnerability ONLY affects Budibase Cloud (SaaS) - self-hosted deployments use native CouchDB views and are not vulnerable. The vulnerability exists in packages/server/src/db/inMemoryView.ts where user-controlled view map functions are directly evaluated without sanitization. The primary impact comes from what lives inside the pod's environment: the app-service pod runs with secrets baked into its environment variables, including INTERNALAPIKEY, JWTSECRET, CouchDB admin credentials, AWS keys, and more. Using the extracted CouchDB credentials, we verified direct database access, enumerated all tenant databases, and confirmed that user records (email addresses) are readable. Details Root Cause File: packages/server/src/db/inMemoryView.ts:28 Why Only Cloud is Vulnerable: File:…

Published by the source

25 Feb 2026, 18:57 UTC

Last modified by the source

25 Feb 2026, 19:26 UTC

Source last checked

26 Oct 2026, 12:42 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-rvhr-26g4-p2r8

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-rvhr-26g4-p2r8

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-rvhr-26g4-p2r8

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# Patch Next advisory brief: CVE-2026-27702

Advisory: Budibase: Remote Code Execution via Unsafe eval() in View Filter Map Function (Budibase Cloud)
IDs: CVE-2026-27702, GHSA-rvhr-26g4-p2r8
Record: https://patchnext.com/advisories/cve-2026-27702 (revision 3, source checked 26 Oct 2026, 12:42 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: budibase 3.30.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm budibase: affected < 3.30.4; fixed in 3.30.4

## Suggested inspection (read-only)
- `npm ls budibase --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.
- 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-rvhr-26g4-p2r8 (GitHub-reviewed advisory GHSA-rvhr-26g4-p2r8 lists affected ranges: npm budibase >=0 <3.30.4)
- Verified: https://osv.dev/vulnerability/GHSA-rvhr-26g4-p2r8 (OSV record GHSA-rvhr-26g4-p2r8 lists affected ranges: npm budibase >=0 <3.30.4 (fixed))

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