SSRF in Budibase Server
CVE-2026-82241
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/Budibase/budibase/security/advisories/GHSA-9754-4wm6-3c8r (vendor-advisory)
- www.vulncheck.com/advisories/budibase-backend-core-ssrf-via-incomplete-default-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82241?
- CVE-2026-82241 is a high-severity vulnerability in Budibase Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.1/10. Published 2026-08-28.
- How severe is CVE-2026-82241?
- High severity. CVSS v3 base score is 7.1 out of 10.