# CVE-2026-48147: Budibase CSRF bypass via unanchored regex in Worker matchers

Source: https://junglewise.ai/threats/cve-2026-48147-budibase-csrf-bypass-via-unanchored-regex-in-worker-matchers  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-27. Updated: 2026-06-12  
License: CC BY 4.0 with a link back

CVE-2026-48147 · Severity: medium · CVSS 6.5 · Published 2026-05-27

Budibase is a low-code platform used to build internal business applications. A security flaw in the Budibase Worker component allows an attacker to bypass Cross-Site Request Forgery (CSRF) protections. By tricking a logged-in administrator into clicking a malicious link, an attacker could perform unauthorized actions such as inviting new admin users, changing global security settings, or modifying user roles, potentially leading to a full takeover of the Budibase instance.

Technologies: [@budibase/backend-core (npm)](https://junglewise.ai/threats/technologies/budibase-backend-core). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-48147 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-48147 being exploited in the wild.

**How severe is CVE-2026-48147?** Medium severity, with a CVSS score of 6.5, published 27 May 2026.

**Which products and versions are affected?** @budibase/backend-core (npm) < 3.35.4, SEMVER:introduced=0,fixed=3.35.4.

**Is there a fix for CVE-2026-48147?** Yes. @budibase/backend-core (npm): upgrade to 3.35.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-48147 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-48147?** Check whether you run @budibase/backend-core (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @budibase/backend-core (npm): upgrade to 3.35.4 or later

  ```sh
  npm install @budibase/backend-core@3.35.4
  ```


## Technical details

The vulnerability exists in the `buildMatcherRegex` and `matches` functions within `packages/backend-core/src/middleware/matchers.ts`. Route patterns used to identify public (non-CSRF protected) endpoints are compiled into regular expressions without start (^) or end ($) anchors. Furthermore, these regexes are tested against the full request URL including the query string. An attacker can bypass CSRF, tenancy, and authentication middleware by appending a known public route pattern (e.g., `/api/global/auth/`) as a query parameter to a request targeting a protected endpoint. This allows for cross-origin state-changing operations like user management and configuration updates. The issue was addressed in version 3.35.4.

## Affected products

- Budibase Budibase < 3.35.4

## Identifiers

- CVE-2026-48147
- GHSA-wxq7-x3qp-vcr8

## Timeline

- 2026-05-21: disclosed
- 2026-06-12: advisory: Updated advisory published

## References

- [https://api.github.com/users/b-hermes](https://api.github.com/users/b-hermes)
- [https://github.com/b-hermes](https://github.com/b-hermes)
- [https://api.github.com/users/b-hermes/gists%7B/gist_id%7D](https://api.github.com/users/b-hermes/gists%7B/gist_id%7D)
- [https://api.github.com/users/b-hermes/repos](https://api.github.com/users/b-hermes/repos)
- [https://avatars.githubusercontent.com/u/39487743?v=4](https://avatars.githubusercontent.com/u/39487743?v=4)
- [https://api.github.com/users/b-hermes/events%7B/privacy%7D](https://api.github.com/users/b-hermes/events%7B/privacy%7D)

## Related threats

- [Budibase SSRF via DNS rebinding in outbound fetch validation](https://junglewise.ai/threats/cve-2026-54353-budibase-ssrf-via-dns-rebinding-in-outbound-fetch-validation)
- [Budibase improper privilege management via missing cache invalidation](https://junglewise.ai/threats/cve-2026-46424-budibase-improper-privilege-management-via-missing-cache)
- [Budibase insecure session cookie configuration leads to account takeover](https://junglewise.ai/threats/cve-2026-42239-budibase-insecure-session-cookie-configuration-leads-to-account)
- [Budibase: Authentication Bypass via Unanchored Regex in Public Endpoint Matcher , Unauthenticated Access to Protected Endpoints](https://junglewise.ai/threats/cve-2026-41428-budibase-authentication-bypass-via-unanchored-regex-in-public)
- [Budibase SSRF in REST datasource connector](https://junglewise.ai/threats/cve-2026-31818-budibase-ssrf-in-rest-datasource-connector)