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CVE-2026-50136— Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials

Quick assessment

Affected
Budibase budibase
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公司开源的一个用于在几分钟内创建内部应用程序、工作流和管理面板的低代码平台。 Budibase 3.39.3之前版本存在授权问题漏洞，该漏洞源于应用服务器未经验证的端点允许生成S3 PutObject预签名URL，可能导致公共调用者请求攻击者控制的存储桶和密钥值的签名上传URL。

CVSS 7.4 · High EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Budibase budibase < 3.39.3 affected
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I. Basic Information for CVE-2026-50136

Vulnerability Information
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Vulnerability Title
Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials
Source: CVE Program / CVE List V5
Vulnerability Description
Budibase is an open-source low-code platform. Prior to 3.39.3, the application server exposes an unauthenticated endpoint that generates S3 PutObject presigned URLs using credentials stored in a workspace datasource. The route is protected only by the recaptcha middleware and does not require authentication, table permission, datasource permission, or builder access. A public caller who knows a workspace ID and S3 datasource ID can request a signed upload URL for attacker-controlled bucket and key values. This vulnerability is fixed in 3.39.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
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公司开源的一个用于在几分钟内创建内部应用程序、工作流和管理面板的低代码平台。 Budibase 3.39.3之前版本存在授权问题漏洞，该漏洞源于应用服务器未经验证的端点允许生成S3 PutObject预签名URL，可能导致公共调用者请求攻击者控制的存储桶和密钥值的签名上传URL。
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 budibase < 3.39.3 -

II. Public POCs for CVE-2026-50136

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8738 chars
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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
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-50136

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Vendor Advisories for CVE-2026-50136 (1)

Same Patch Batch · Budibase · 2026-06-26 · 7 CVEs total

CVE-2026-54350 10.0 CRITICAL Budibase: Anonymous NoSQL operator injection via published-app query templates
CVE-2026-54352 9.6 CRITICAL Budibase: Arbitrary file read by workspace-builder via PWA-zip symlink upload
CVE-2026-54353 8.5 HIGH Budibase: Potential SSRF DNS rebinding bypass in outbound fetch validation
CVE-2026-54351 8.2 HIGH Budibase: Mass Assignment in Webhook Trigger Allows Cross-Workspace Automation Execution v
CVE-2026-50132 7.3 HIGH Budibase: Chat Identity Link Hijacking via Missing Consent & CSRF — Account Impersonation
CVE-2026-50137 Budibase: POST /api/attachments/:datasourceId/url is unauthenticated and lets anonymous ca

IV. Related Vulnerabilities

Same product: budibase
Same vendor: Budibase
Same weakness: CWE-306

V. Comments for CVE-2026-50136

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