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CVE-2026-54353— Budibase: Potential SSRF DNS rebinding bypass in outbound fetch validation

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 3.39.9之前版本存在竞争条件问题漏洞，该漏洞源于DNS重新绑定问题，可能导致具有自动化权限的经过身份验证的用户绕过SSRF黑名单，通过控制主机名在验证时返回公网IP而在实际连接时返回私有/内网IP，从而实现非盲SSRF攻击，影响访问内部服务。

CVSS 8.5 · High EPSS 0.21% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
Budibase budibase < 3.39.9 affected
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I. Basic Information for CVE-2026-54353

Vulnerability Information
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Vulnerability Title
Budibase: Potential SSRF DNS rebinding bypass in outbound fetch validation
Source: CVE Program / CVE List V5
Vulnerability Description
Budibase is an open-source low-code platform. Prior to 3.39.9, authenticated users with automation permissions can bypass Budibase's SSRF blacklist through DNS rebinding. The outbound fetch flow validates a hostname against the blacklist before the request is sent, but the actual socket connection later performs a separate DNS lookup through node-fetch. Since the validated IPs are never pinned to the connection, an attacker-controlled hostname can return a public IP during validation and a private/internal IP during the real connection. This results in a non-blind SSRF primitive against internal services reachable from the Budibase host, including loopback, RFC1918 ranges, and cloud metadata endpoints. This vulnerability is fixed in 3.39.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Budibase 竞争条件问题漏洞
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 3.39.9之前版本存在竞争条件问题漏洞，该漏洞源于DNS重新绑定问题，可能导致具有自动化权限的经过身份验证的用户绕过SSRF黑名单，通过控制主机名在验证时返回公网IP而在实际连接时返回私有/内网IP，从而实现非盲SSRF攻击，影响访问内部服务。
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 < 3.39.9 -

II. Public POCs for CVE-2026-54353

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 14075 chars
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Trigger conditions & impact
Full executable POC code
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III. Intelligence Information for CVE-2026-54353

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Vendor Advisories for CVE-2026-54353 (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-2026-54351 8.2 HIGH Budibase: Mass Assignment in Webhook Trigger Allows Cross-Workspace Automation Execution v
CVE-2026-50136 7.4 HIGH Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with sto
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-367

V. Comments for CVE-2026-54353

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