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.

CVE-2026-82241 affects Budibase's backend-core package (@budibase/backend-core), which omits the shared address space range 100.64.0.0/10 from its default SSRF blacklist (DEFAULT_BLACKLIST). This omission allows authenticated users with Builder permissions to send crafted REST datasource query preview requests via POST /api/queries/preview to services within the 100.64.0.0/10 range. The server processes these requests and returns the responses, effectively enabling Server-Side Request Forgery (SSRF). The vulnerability only impacts self-hosted deployments that have not overridden the default blacklist via the BLACKLIST_IPS environment variable. No official patch had been released at the time of publication. The recommended remediation is to manually add 100.64.0.0/10 to the DEFAULT_BLACKLIST configuration.