by Kastro
Paper/Archive/CVE-2026-31818

CVE-2026-31818

Budibase budibase — Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist

EPSS 0.4%public exploitCVSS 9.9
critical.is priorityof 100
46
CVSS 9.9 (NVD)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 31.6.316 × 206.3Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

Budibase is an open-source low-code platform. Prior to version 3.33.4, a server-side request forgery (SSRF) vulnerability exists in Budibase's REST datasource connector. The platform's SSRF protection mechanism (IP blacklist) is rendered completely ineffective because the BLACKLIST_IPS environment variable is not set by default in any of the official deployment configurations. When this variable is empty, the blacklist function unconditionally returns false, allowing all requests through without restriction. This issue has been patched in version 3.33.4.

Affected

ProductAffectedFixed inSource
budibase< 3.33.4–CNA

Scores by source

NVD9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
GitHub_M (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

refgithub.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45refgithub.com/Budibase/budibase/pull/18236refgithub.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732refgithub.com/Budibase/budibase/releases/tag/3.33.4