CVE-2026-72859

High

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.

SeverityHigh

CVSS7.7

Exploit probability—

Product@budibase/server

PublishedAug 14, 2026

First seenAug 14, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Vendor advisories

github.com/Budibase/budibase/security/advisories/GHSA-xcx6-4f2g-hhgx

Affected products

Product	Affected versions	Fixed in
@budibase/servernpm	v ≤ 3.38.1	—

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