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Vulnerability record · CVE-2026-31818 · published 3 April 2026

CVE-2026-31818: Budibase server-side request forgery (ssrf) vulnerability

Budibase · Budibase

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.

9.9 CVSS 3.1 Critical EPSS 0.43% · top 64.9% CWE-918 · Server-side request forgery (SSRF)CWE-1188 · Insecure default initialization
9.9CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
24 Jul 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732 Patch
https://github.com/Budibase/budibase/pull/18236 Issue TrackingPatch
https://github.com/Budibase/budibase/releases/tag/3.33.4 ProductRelease Notes
https://github.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45 ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-31818), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.