CVE-2026-72859

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 v3 7.7 HIGH

7.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-14 12:16

Updated : 2026-08-31 20:33

NVD link : CVE-2026-72859

Mitre link : CVE-2026-72859

CVE.ORG link : CVE-2026-72859

JSON object : View

Products Affected

No product.

CWE

CWE-863

Incorrect Authorization

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