CVE-2026-41428 Budibase: Authentication Bypass via Unanchored Regex in Public Endpoint Matcher — Unauthenticated Access to Protected Endpoints
Attackers can bypass authentication and access protected endpoints by appending public paths to query strings due to unanchored regex matching.
- 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-2026-41428?
CVE-2026-41428 is a critical authentication bypass vulnerability in budibase, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Budibase is an open-source low-code platform. Prior to 3.35.4, the authenticated middleware uses unanchored regular expressions to match public (no-auth) endpoint patterns against ctx.request.url. Since ctx.request.url in Koa includes the query string, an attacker can access any protected endpoint by appending a public endpoint path as a query parameter. For example, POST /api/global/users/search?x=/api/system/status bypasses all authentication because the regex /api/system/status/ matches in the query string portion of the URL. This vulnerability is fixed in 3.35.4.
Weakness: CWE-287
Which versions are affected by CVE-2026-41428?
2 open source packages ship an affected version, including @budibase/backend-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@budibase/backend-core npm | All versions to 3.35.3 | None |
@budibase/backend-core npm | All versions to 3.35.3 | None |
Products include Budibase Budibase.
How do I fix CVE-2026-41428?
No fix has been published for CVE-2026-41428 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-2026-41428 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41428 exists.
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-8783-3wgf-jggf.