CVE-2026-31818 CRITICAL

CVE-2026-31818: Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist

Vendor Budibase
Product budibase
Weakness CWE-918 · SSRF
Published April 3, 2026
Last update April 3, 2026
View on NVD All CVEs

CVSS base score

9.6/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 3, 2026 CVE published
April 3, 2026 Record updated