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CVE-2026-31818

Budibase server-side request forgery (SSRF)

9.6 CRITICALPublic exploitEPSS 0.43%
  1. Published3 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected products

Budibase< 3.33.4

Remediation

Fixed in
Budibase≥ 3.33.4

References

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Frequently asked

Is CVE-2026-31818 being actively exploited?

CVE-2026-31818 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.43%.

How severe is CVE-2026-31818?

CVE-2026-31818 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.43% probability of exploitation.

Which products are affected by CVE-2026-31818?

Affected products include Budibase.

How do I fix CVE-2026-31818?

Upgrade affected software to a fixed version, for example Budibase 3.33.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-31818 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.