CVE-2026-48147

The record

Budibase is an open-source low-code platform. Prior to 3.35.4, the buildMatcherRegex() / matches() functions in packages/backend-core/src/middleware/matchers.ts route patterns are compiled into unanchored regular expressions and tested against ctx.request.url, which includes the full query string. The CSRF middleware in the Budibase Worker uses this matching system to decide whether to skip CSRF token validation. An unauthenticated attacker can forge state-changing cross-origin requests against any Worker API endpoint by injecting a public route pattern into the query string, causing the CSRF middleware to skip token validation entirely. This allows actions such as sending admin invites, modifying global configuration, and managing users without a valid CSRF token. This vulnerability is fixed in 3.35.4.

Affected packages

Related vulnerabilities

• GHSA-wxq7-x3qp-vcr8 Budibase: Unanchored Regex in `matchers.ts` Allows CSRF Bypass via Query String Injection… Same vulnerability
• CVE-2026-46424 Budibase is an open-source low-code platform. Also affects @budibase/backend-core
• GHSA-6vp2-6r7m-2jvx Budibase: Missing Cache Invalidation on Public API Role Unassignment Allows Revoked Users… Also affects @budibase/backend-core
• CVE-2026-42239 Budibase is an open-source low-code platform. Also affects @budibase/backend-core
• CVE-2026-41428 Budibase is an open-source low-code platform. Also affects @budibase/backend-core
• GHSA-4f9j-vr4p-642r Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full… Also affects @budibase/backend-core
• GHSA-8783-3wgf-jggf Budibase: Authentication Bypass via Unanchored Regex in Public Endpoint Matcher… Also affects @budibase/backend-core
• GHSA-7r9j-r86q-7g45 Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist Also affects @budibase/backend-core