critical9.6
CVE-2026-31818
Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @budibase/backend-core | < 3.33.4 | 3.33.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Budibase | Budibase | before 3.33.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732
- https://github.com/Budibase/budibase/pull/18236
- https://github.com/Budibase/budibase/releases/tag/3.33.4
- https://github.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45
- https://github.com/advisories/GHSA-7r9j-r86q-7g45
- https://nvd.nist.gov/vuln/detail/CVE-2026-31818