How severe is CVE-2026-31818?

CVE-2026-31818 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-31818 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31818?

CVE-2026-31818 affects Budibase. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31818?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-31818 have an EU (EUVD) identifier?

Yes. CVE-2026-31818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18792.

When was CVE-2026-31818 published?

CVE-2026-31818 was published on 2026-04-03 and last updated on 2026-06-17.

CVE-2026-31818

CVE-2026-31818 is a critical-severity vulnerability in Budibase with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18792
Weakness: CWE-918
Affected product: Budibase
Published: 2026-04-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-31818?: 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.
How severe is CVE-2026-31818?: CVE-2026-31818 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-31818 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31818?: CVE-2026-31818 affects Budibase. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31818?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-31818 have an EU (EUVD) identifier?: Yes. CVE-2026-31818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18792.
When was CVE-2026-31818 published?: CVE-2026-31818 was published on 2026-04-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:budibase:budibase:*:*:*:*:*:*:*:*

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