budibase up to 3.31.4 API Endpoint authorized injection

Summaryinfo

A vulnerability was found in budibase up to 3.31.4. It has been declared as critical. This vulnerability affects the function authorized of the component API Endpoint. Such manipulation leads to injection. This vulnerability is referenced as CVE-2026-31816. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in budibase up to 3.31.4 and classified as critical. Affected by this issue is the function authorized of the component API Endpoint. The manipulation with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Budibase is a low code platform for creating internal tools, workflows, and admin panels. In 3.31.4 and earlier, the Budibase server's authorized() middleware that protects every server-side API endpoint can be completely bypassed by appending a webhook path pattern to the query string of any request. The isWebhookEndpoint() function uses an unanchored regex that tests against ctx.request.url, which in Koa includes the full URL with query parameters. When the regex matches, the authorized() middleware immediately calls return next(), skipping all authentication, authorization, role checks, and CSRF protection. This means a completely unauthenticated, remote attacker can access any server-side API endpoint by simply appending ?/webhooks/trigger (or any webhook pattern variant) to the URL.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-31816 since 03/09/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/12/2026). The MITRE ATT&CK project declares the attack technique as T1055.

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). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Open Source Budibase

Productinfo

Name

• budibase

Version

• 3.31.0
• 3.31.1
• 3.31.2
• 3.31.3
• 3.31.4

Website

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

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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