Vulnerability · Published Apr 3, 2026 · Assigned by GitHub_M
CVE-2026-31818Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist
Critical 9.6
In plain English
A critical-severity server-side request forgery in budibase from Budibase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @budibase/backend-core | 3.33.4 | GHSA-7r9j-r86q-7g45 |
Affected products (as reported)
Weakness: CWE-918, CWE-1188 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
References
- https://github.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45 x_refsource_CONFIRM
- https://github.com/Budibase/budibase/pull/18236 x_refsource_MISC
- https://github.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732 x_refsource_MISC
- https://github.com/Budibase/budibase/releases/tag/3.33.4 x_refsource_MISC