---
id: CVE-2026-82241
title: >-
  Budibase backend-core (@budibase/backend-core, as used by @budibase/server)
  omits the shared address space range 100.64.0.0/10 from its default SSRF
  blacklist (DEFAULT_BLACKLIST) used by REST datasource query previews
summary: >-
  Budibase backend-core (@budibase/backend-core, as used by @budibase/server)
  omits the shared address space range 100.64.0.0/10 from its default SSRF
  blacklist (DEFAULT_BLACKLIST) used by REST datasource query previews. When the
  default b…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-918
vendor: budibase
product: server
affected:
  - server < 3.41.3
published: '2026-08-28'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:47.040'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82241'
references:
  - url: >-
      https://github.com/Budibase/budibase/security/advisories/GHSA-9754-4wm6-3c8r
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/budibase-backend-core-ssrf-via-incomplete-default-blacklist
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-28T14:46:47.075515Z'
epss: 0.00301
epssPercentile: 0.20942
ingestedAt: '2026-10-08T16:52:14.732Z'
---

## Overview

Budibase backend-core (@budibase/backend-core, as used by @budibase/server) omits the shared address space range 100.64.0.0/10 from its default SSRF blacklist (DEFAULT_BLACKLIST) used by REST datasource query previews. When the default blacklist is active (i.e., a self-hosted deployment has not defined BLACKLIST_IPS), an authenticated user with the Builder permission can submit a REST datasource query preview request to POST /api/queries/preview targeting a reachable HTTP(S) service in the 100.64.0.0/10 range, causing the server to send a request to that target and return its response through the preview flow. Per the advisory, no released fix was identified at the time of publication; remediation is to add 100.64.0.0/10 to DEFAULT_BLACKLIST.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.