budibase up to 3.31.5 ZIP /api/pwa/process-zip join path traversal

Summaryinfo

A vulnerability has been found in budibase up to 3.31.5 and classified as critical. Affected by this vulnerability is the function join of the file /api/pwa/process-zip of the component ZIP Handler. The manipulation leads to path traversal. This vulnerability is uniquely identified as CVE-2026-30240. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in budibase up to 3.31.5. This issue affects the function join of the file /api/pwa/process-zip of the component ZIP Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Budibase is a low code platform for creating internal tools, workflows, and admin panels. In 3.31.5 and earlier, a path traversal vulnerability in the PWA (Progressive Web App) ZIP processing endpoint (POST /api/pwa/process-zip) allows an authenticated user with builder privileges to read arbitrary files from the server filesystem, including /proc/1/environ which contains all environment variables — JWT secrets, database credentials, encryption keys, and API tokens. The server reads attacker-specified files via unsanitized path.join() with user-controlled input from icons.json inside the uploaded ZIP, then uploads the file contents to the object store (MinIO/S3) where they can be retrieved through signed URLs. This results in complete platform compromise as all cryptographic secrets and service credentials are exfiltrated in a single request.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-30240 since 03/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/13/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0651). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• Open Source Budibase

Productinfo

Name

• budibase

Version

• 3.31.0
• 3.31.1
• 3.31.2
• 3.31.3
• 3.31.4
• 3.31.5

Website

• Product: https://github.com/Budibase/budibase/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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