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  5. CVE-2026-31818

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

April 3, 2026

FieldValue
TitleSSRF via REST Connector with Empty Default Blacklist Leading to Full Internal Data Exfiltration
ProductBudibase
Version3.30.6 (latest stable as of 2026-02-25)
ComponentREST Datasource Integration + Backend-Core Blacklist Module
SeverityCritical
Attack VectorNetwork
Privileges RequiredLow (Builder role, or QUERY WRITE for execution of pre-existing queries)
User InteractionNone
Affected DeploymentsAll self-hosted instances without explicit BLACKLIST_IPS configuration (believed to be the vast majority)

References

  • github.com/Budibase/budibase
  • github.com/Budibase/budibase/commit/5b0fe83d4ece52696b62589cba89ef50cc009732
  • github.com/Budibase/budibase/pull/18236
  • github.com/Budibase/budibase/releases/tag/3.33.4
  • github.com/Budibase/budibase/security/advisories/GHSA-7r9j-r86q-7g45
  • github.com/advisories/GHSA-7r9j-r86q-7g45
  • nvd.nist.gov/vuln/detail/CVE-2026-31818

Code Behaviors & Features

Detect and mitigate CVE-2026-31818 with GitLab Dependency Scanning

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Affected versions

All versions before 3.33.4

Fixed versions

  • 3.33.4

Solution

Upgrade to version 3.33.4 or above.

Impact 9.6 CRITICAL

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

Learn more about CVSS

Weakness

  • CWE-1188: Initialization of a Resource with an Insecure Default
  • CWE-918: Server-Side Request Forgery (SSRF)

Source file

npm/@budibase/backend-core/CVE-2026-31818.yml

Spotted a mistake? Edit the file on GitLab.

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