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Vulnerability record · CVE-2026-72859 · published 14 August 2026

CVE-2026-72859: Incorrect authorization vulnerability

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.

8.3 CVSS 4.0 High EPSS 0.31% · top 78.5% CWE-863 · Incorrect authorization Deferred
8.3CVSS 4.0 base score
0.31%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
31 Aug 2026Last modified by NVD

Description

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.

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:

References

LinkTags
https://github.com/Budibase/budibase/security/advisories/GHSA-xcx6-4f2g-hhgx
https://www.vulncheck.com/advisories/budibase-before-authorization-regression-via-s3-presigned-url
https://github.com/Budibase/budibase/security/advisories/GHSA-xcx6-4f2g-hhgx

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Source: NIST National Vulnerability Database (record CVE-2026-72859), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.