CVE-2026-82241

High

Description

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.

SeverityHigh

CVSS7.1

Exploit probability—

ProductBudibase Server

PublishedAug 28, 2026

First seenAug 28, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

budibase server3.41.3 or later

Vendor advisories

github.com/Budibase/budibase/security/advisories/GHSA-9754-4wm6-3c8r

Affected products

Product	Affected versions	Fixed in
budibase server	v < 3.41.3	3.41.3

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