CVE-2026-31816 Budibase Universal Auth Bypass via Webhook Query Param Injection
Unauthenticated attackers can bypass all authentication and authorization checks on any API endpoint by appending a specific webhook pattern to the URL query string.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-31816?
CVE-2026-31816 is a critical authentication bypass vulnerability in budibase, published on 9 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-74
Which versions are affected by CVE-2026-31816?
It affects 1 product.
Products include Budibase Budibase.
How do I fix CVE-2026-31816?
No fix has been published for CVE-2026-31816 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-31816 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31816 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Other vulnerabilities in budibase
- CVE-2026-54350 Budibase: Anonymous NoSQL operator injection via published-app query templates
- CVE-2026-27702 Budibase Vulnerable to Remote Code Execution via Unsafe eval() in View Filter Map Function (Budibase Cloud)
- CVE-2026-54352 Budibase: Arbitrary file read by workspace-builder via PWA-zip symlink upload
- CVE-2026-31818 Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist
- CVE-2026-30240 Budibase PWA ZIP Upload Path Traversal Allows Reading Arbitrary Server Files Including All Environment Secrets
Sources
Also known as GHSA-gw94-hprh-4wj8.