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CVE-2026-72859— Budibase 3.39.4 before 3.40.0 Authorization Regression via S3 Presigned URL

Quick assessment

Affected
budibase server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Budibase是英国Budibase公司开源的一个低代码应用开发平台。 Budibase 3.39.4至3.40.0之前版本存在授权问题漏洞，该漏洞源于S3附件上传端点存在授权回归问题，允许BASIC用户通过发送POST请求获取S3 PutObject预签名URL，攻击者可指定任意S3桶，利用存储的IAM凭据生成预签名URL，实现未授权文件上传。

CVSS 7.7 · High EPSS 0.31% · P22

Affected Version Matrix 2

VendorProduct Version RangeStatus
budibase server 3.39.4< 3.40.0 affected
3.40.0 unaffected
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I. Basic Information for CVE-2026-72859

Vulnerability Information
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Vulnerability Title
Budibase 3.39.4 before 3.40.0 Authorization Regression via S3 Presigned URL
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Budibase 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Budibase是英国Budibase公司开源的一个低代码应用开发平台。 Budibase 3.39.4至3.40.0之前版本存在授权问题漏洞，该漏洞源于S3附件上传端点存在授权回归问题，允许BASIC用户通过发送POST请求获取S3 PutObject预签名URL，攻击者可指定任意S3桶，利用存储的IAM凭据生成预签名URL，实现未授权文件上传。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
budibase server 3.39.4 ~ 3.40.0 -

II. Public POCs for CVE-2026-72859

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 7659 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-72859

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Vendor Advisories for CVE-2026-72859 (2)

IV. Related Vulnerabilities

Same product: server
Same vendor: budibase
Same weakness: CWE-863

V. Comments for CVE-2026-72859

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