EUVD-2026-58653
GHSA-9pwj-99rm-cq6j
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible endpoint requiring only BASIC user auth (PR:L); scope change (S:C) because attacker writes to external S3 buckets beyond the Budibase system; integrity-only impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
Budibase versions 3.39.4 before 3.40.0 contain an authorization regression in the S3 attachment upload endpoint that allows BASIC users to obtain S3 PutObject presigned URLs by sending POST requests to the attachments endpoint. The route was changed from a BUILDER permission check to a TABLE/WRITE check, which BASIC users hold by default. Attackers can specify arbitrary S3 buckets in the request body to generate presigned URLs for writing to any bucket accessible by the stored IAM credentials, enabling unauthorized file uploads.
AnalysisAI
Authorization regression in Budibase v3.39.4 enables any authenticated BASIC user to generate S3 PutObject presigned URLs for arbitrary S3 buckets, bypassing the intended BUILDER-level permission gate on the attachment upload endpoint. The regression introduced in v3.39.4 - where the route guard was changed from authorized(BUILDER) to authorized(PermissionType.TABLE, PermissionLevel.WRITE) - gives all default BASIC users access to an endpoint that was explicitly restricted to builders. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a BASIC user account on the target Budibase application - the lowest authenticated role available. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.3 with vector AV:N/AC:L/AT:N/PR:L/UI:N reflects a network-accessible, low-complexity attack requiring only a BASIC user account - the lowest authenticated tier on the platform. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to upgrade Budibase server to version 3.40.0 or later per the CVE description, which covers the fix for the v3.39.4 regression. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, verify your Budibase version and review S3/CloudTrail access logs for unauthorized PutObject operations against configured buckets. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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