CVE-2026-31816
Budibase Universal Auth Bypass via Webhook Query Param Injection
- Published
- Mar 9, 2026
- Updated
- Mar 10, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NModerate · next 30 days
- Percentile
- 96.7%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
2- CVE-2026-31816-rshellExploit
Exploits CVE-2026-31816 in Budibase to bypass authentication, upload a malicious datasource plugin, and execute a reverse shell for remote access.
- CVE-2026-31816Exploit
CVE-2026-31816 - Budibase Authentication Bypass to RCE
Responsible use
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