CVE-2026-31818
Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist
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.
INFO
Published Date :
April 3, 2026, 4:16 p.m.
Last Modified :
April 8, 2026, 9:19 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Budibase to version 3.33.4.
- Configure the BLACKLIST_IPS environment variable.
- Deploy the updated Budibase instance.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-31818.
| URL | Resource |
|---|---|
| https://github.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732 | Patch |
| https://github.com/Budibase/budibase/pull/18236 | Issue Tracking Patch |
| https://github.com/Budibase/budibase/releases/tag/3.33.4 | Product Release Notes |
| https://github.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45 | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31818 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31818
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-31818 vulnerability anywhere in the article.
-
Daily CyberSecurity
Budibase Patches Critical RCE and SSRF Vulnerabilities
Budibase, the popular open-source low-code platform used by engineers to rapidly build internal tools, has released urgent security patches to address two critical vulnerabilities. The flaws, which in ... Read more
The following table lists the changes that have been made to the
CVE-2026-31818 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L Added CPE Configuration OR *cpe:2.3:a:budibase:budibase:*:*:*:*:*:*:*:* versions up to (excluding) 3.33.4 Added Reference Type GitHub, Inc.: https://github.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/Budibase/budibase/pull/18236 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/Budibase/budibase/releases/tag/3.33.4 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45 Types: Exploit, Mitigation, Vendor Advisory -
New CVE Received by [email protected]
Apr. 03, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N Added CWE CWE-918 Added CWE CWE-1188 Added Reference https://github.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732 Added Reference https://github.com/Budibase/budibase/pull/18236 Added Reference https://github.com/Budibase/budibase/releases/tag/3.33.4 Added Reference https://github.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45