Budibase: Path traversal in plugin file upload enables arbitrary directory deletion and file write

Exploitation

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

CVSS

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

EPSS

• CVE-2026-35214: 0.56% estimated exploitation activity in the next 30 days; percentile 46.89 (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 The plugin file upload endpoint (POST /api/plugin/upload) passes the user-supplied filename directly to createTempFolder() without sanitizing path traversal sequences. An attacker with Global Builder privileges can craft a multipart upload with a filename containing ../ to delete arbitrary directories via rmSync and write arbitrary files via tarball extraction to any filesystem path the Node.js process can access. Severity - Attack Vector: Network — exploitable via the plugin upload HTTP API - Attack Complexity: Low — no special conditions; a single crafted multipart request suffices - Privileges Required: High — requires Global Builder role (GLOBALBUILDER permission) - User Interaction: None - Scope: Changed — the plugin upload feature is scoped to a temp directory, but the traversal escapes to the host filesystem - Confidentiality Impact: None — the vulnerability enables deletion and writing, not reading - Integrity Impact: High — attacker can delete arbitrary directories…

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 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-2wfh-rcwf-wh23

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-2wfh-rcwf-wh23

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# Patch Next advisory brief: CVE-2026-35214

Advisory: Budibase: Path traversal in plugin file upload enables arbitrary directory deletion and file write
IDs: CVE-2026-35214, GHSA-2wfh-rcwf-wh23
Record: https://patchnext.com/advisories/cve-2026-35214 (revision 2, 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: High (CVSS 8.7)
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://osv.dev/vulnerability/GHSA-2wfh-rcwf-wh23 (OSV record GHSA-2wfh-rcwf-wh23 lists affected ranges: npm @budibase/server >=0 <3.33.4 (fixed))
- Verified: https://github.com/advisories/GHSA-2wfh-rcwf-wh23 (GitHub-reviewed advisory GHSA-2wfh-rcwf-wh23 lists affected ranges: npm @budibase/server >=0 <3.33.4)

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