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Vulnerability record

CVE-2026-72859

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What it is

Reported

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. Source description excerpt; complete tracked detail loads below.

Source reported · Source: CVE record · Source last published: · Source last updated: · Tracker data as of:

What is affected

Reported

budibase — server. Product-level identification only; no affected-version conclusion is available from this field.

Source reported · Source: CVE record · Source last published: · Source last updated: · Tracker data as of:

Urgency and basis

Reported

Track* · 217.9

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Exploitation evidence

Not reported

Not reported by tracked sources.

What to do

Reported

A source remediation link is available. Validate that guidance against the affected product and your environment.

Source remediation ↗

Source reported · Tracked source remediation field · Source last updated: · Tracker data as of:

Evidence detail

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