CVE-2026-31818

CRITICAL 9.6

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

CVSS Score

9.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-918 CWE-1188
Vendor	budibase
Product	budibase
Published	Apr 3, 2026
Last Updated	Apr 3, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

Budibase / budibase

< 3.33.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45 github.com: https://github.com/Budibase/budibase/pull/18236 github.com: https://github.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732 github.com: https://github.com/Budibase/budibase/releases/tag/3.33.4