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CVE-2026-31818 Budibase CVE debrief

Budibase, an open-source low-code platform, had a server-side request forgery (SSRF) vulnerability prior to version 3.33.4. The platform's SSRF protection mechanism, which relies on an IP blacklist defined by the BLACKLIST_IPS environment variable, was ineffective by default in official deployment configurations. This allowed unauthorized requests to pass through without restriction. The issue was patched in version 3.33.4. Affected product or component is Budibase's REST datasource connector. The vulnerability class is server-side request forgery (SSRF). Likely operational impact includes unauthorized requests passing through without restriction. Source-confidence limits are based on the CVE record and NVD entry.

Vendor
Budibase
Product
Unknown
CVSS
CRITICAL 9.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-03
Original CVE updated
2026-07-24
Advisory published
2026-04-03
Advisory updated
2026-07-24

Who should care

Users of Budibase versions before 3.33.4 should apply the patch to prevent potential SSRF attacks. This vulnerability has a critical CVSS score of 9.6. Affected operators, platform administrators, vulnerability management teams, and security teams should prioritize updating Budibase to version 3.33.4 or later. Review and set the BLACKLIST_IPS environment variable according to your deployment configurations. Monitor for suspicious requests to the Budibase platform.

Technical summary

The Budibase platform's REST datasource connector had a server-side request forgery (SSRF) vulnerability. The SSRF protection mechanism relies on the BLACKLIST_IPS environment variable. However, this variable is not set by default in official deployment configurations, rendering the blacklist function ineffective. This allowed all requests to pass through without restriction. The issue was patched in version 3.33.4. Affected product context includes Budibase versions before 3.33.4. Defensive impact includes updating Budibase to version 3.33.4 or later and reviewing compensating controls.

Defensive priority

High priority should be given to updating Budibase to version 3.33.4 or later to mitigate this critical vulnerability. Review and set the BLACKLIST_IPS environment variable according to your deployment configurations. Monitor for suspicious requests to the Budibase platform.

Recommended defensive actions

  • Update Budibase to version 3.33.4 or later
  • Review and set the BLACKLIST_IPS environment variable according to your deployment configurations
  • Monitor for suspicious requests to the Budibase platform
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record was published on 2026-04-03T16:16:39.800Z and last modified on 2026-07-24T22:10:00.140Z. The NVD entry is currently Analyzed. The Budibase platform's REST datasource connector had a server-side request forgery (SSRF) vulnerability. The SSRF protection mechanism relies on the BLACKLIST_IPS environment variable. However, this variable is not set by default in official deployment configurations, rendering the blacklist function ineffective. This allowed all requests to pass through without restriction. The issue was patched in version 3.33.4. Evidence limits suggest that defenders verify patch deployment and review compensating controls.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-31818 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-31818

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-31818 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-31818

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.