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CVE-2026-31818— Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist

CVSS 9.6 · Critical EPSS 0.01% · P3
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I. Basic Information for CVE-2026-31818

Vulnerability Information
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Vulnerability Title
Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist
Source: NVD (National Vulnerability Database)
Vulnerability Description
Budibase is an open-source low-code platform. Prior to version 3.33.4, a server-side request forgery (SSRF) vulnerability exists in Budibase's REST datasource connector. The platform's SSRF protection mechanism (IP blacklist) is rendered completely ineffective because the BLACKLIST_IPS environment variable is not set by default in any of the official deployment configurations. When this variable is empty, the blacklist function unconditionally returns false, allowing all requests through without restriction. This issue has been patched in version 3.33.4.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Budibase 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Budibase是英国Budibase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 3.33.4之前版本存在安全漏洞，该漏洞源于SSRF保护机制因环境变量未设置而失效，可能导致服务端请求伪造攻击。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
Budibasebudibase < 3.33.4 -

II. Public POCs for CVE-2026-31818

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 6335 chars
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III. Intelligence Information for CVE-2026-31818

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Same Patch Batch · Budibase · 2026-04-03 · 6 CVEs total

CVE-2026-352169.1 CRITICALBudibase: Unauthenticated Remote Code Execution via Webhook Trigger and Bash Automation St
CVE-2026-352188.7 HIGHBudibase: Stored XSS via unsanitized entity names rendered with {@html} in Builder Command
CVE-2026-352148.7 HIGHBudibase: Path traversal in plugin file upload enables arbitrary directory deletion and fi
CVE-2026-250435.3 MEDIUMBudibase: Unauthenticated Password Reset Endpoint Lacks Rate Limiting, Enabling Email Floo
CVE-2026-25044Budibase: Command Injection in Bash Automation Step

IV. Related Vulnerabilities

Same product: budibase
Same vendor: Budibase
Same weakness: CWE-918

V. Comments for CVE-2026-31818

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