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CVE-2026-54356— Budibase authenticated arbitrary S3 signed upload URL issuance via `/api/attachments/:datasourceId/url`

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公司开源的一个低代码应用开发平台。 Budibase 3.41.3之前版本存在授权问题漏洞，该漏洞源于对POST /api/attachments/:datasourceId/url接口的访问控制不当，允许已认证的BASIC角色用户提供攻击者控制的bucket和key值，获取基于存储的S3数据源凭据的signedUrl和publicUrl值。

CVSS 7.1 · High EPSS 0.35% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
Budibase budibase < 3.41.3 affected
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I. Basic Information for CVE-2026-54356

Vulnerability Information
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Vulnerability Title
Budibase authenticated arbitrary S3 signed upload URL issuance via `/api/attachments/:datasourceId/url`
Source: CVE Program / CVE List V5
Vulnerability Description
Budibase is an open-source low-code platform. Prior to 3.41.3, POST /api/attachments/:datasourceId/url in packages/server/src/api/routes/static.ts and packages/server/src/api/controllers/static/index.ts allows an authenticated published-app user with the BASIC role to supply attacker-controlled bucket and key values and obtain signedUrl and publicUrl values backed by stored S3 datasource credentials. This issue is fixed in version 3.41.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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公司开源的一个低代码应用开发平台。 Budibase 3.41.3之前版本存在授权问题漏洞，该漏洞源于对POST /api/attachments/:datasourceId/url接口的访问控制不当，允许已认证的BASIC角色用户提供攻击者控制的bucket和key值，获取基于存储的S3数据源凭据的signedUrl和publicUrl值。
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 < 3.41.3 -

II. Public POCs for CVE-2026-54356

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10580 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
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III. Intelligence Information for CVE-2026-54356

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Vendor Advisories for CVE-2026-54356 (1)

Vendor Pages for CVE-2026-54356 (1)

Same Patch Batch · Budibase · 2026-08-17 · 4 CVEs total

CVE-2026-73410 8.5 HIGH Budibase: SSRF via DNS rebinding in the REST datasource integration
CVE-2026-64657 8.4 HIGH Budibase: Database Connector SQL Injections in PostgreSQL, MS SQL, and MySQL
CVE-2026-35219 7.1 HIGH Budibase: SSRF in Automation Steps - Webhook, Zapier, N8N, Slack, Discord Bypass IP Blackl

IV. Related Vulnerabilities

Same product: budibase
Same vendor: Budibase
Same weakness: CWE-862

V. Comments for CVE-2026-54356

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