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CVE-2026-72859

Budibase 3.39.4 before 3.40.0 Authorization Regression via S3 Presigned URL

Published: Aug 14, 2026Updated: Aug 14, 2026 Sources: CVE List NVDCWE-863
7.7HIGH
NVD MITRE
EPSS Score
0.2%
Top 92.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-863

Affected Products

budibase
commercialaka budibase/budibase
serverMixed
Cloud & SaaS / saas-application

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
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References

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

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