CVE-2026-82241 Budibase backend-core SSRF via incomplete default blacklist
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-82241?
CVE-2026-82241 is a high-severity vulnerability in budibase server, published on 28 Aug 2026.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-82241?
How do I fix CVE-2026-82241?
No fix has been published for CVE-2026-82241 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-82241 being exploited?
There is no known exploitation of CVE-2026-82241 in the wild and no public exploit code.
Sources
Also known as GHSA-3fqg-454w-h447, GHSA-9754-4wm6-3c8r.