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CVE-2026-46426— Budibase: Unrestricted Upload of File with Dangerous Type

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 3.38.2之前版本存在安全漏洞，该漏洞源于文件上传端点未对认证用户强制执行活动内容限制，可能导致存储型跨站脚本攻击。

CVSS 7.6 · High EPSS 0.30% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
Budibase budibase < 3.38.2 affected
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I. Basic Information for CVE-2026-46426

Vulnerability Information
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Vulnerability Title
Budibase: Unrestricted Upload of File with Dangerous Type
Source: CVE Program / CVE List V5
Vulnerability Description
Budibase is an open-source low-code platform. Prior to 3.38.2, the file upload endpoint POST /api/attachments/process does not enforce active-content restrictions for authenticated users. The checks for dangerous file extensions are conditionally wrapped inside if (isPublicUser) or if (isPublicUser || !env.SELF_HOSTED), meaning any authenticated builder can upload executable web content — SVG files with inline <script> tags, HTML pages with JavaScript, .js modules — which are then stored in the object store (MinIO/S3) with their correct MIME types. When the resulting signed URL is opened by any app user, the browser executes the payload. Impact is persistent stored XSS over all application end users. This vulnerability is fixed in 3.38.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
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 3.38.2之前版本存在安全漏洞，该漏洞源于文件上传端点未对认证用户强制执行活动内容限制，可能导致存储型跨站脚本攻击。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Budibase budibase < 3.38.2 -

II. Public POCs for CVE-2026-46426

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 9972 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
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-46426

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Vendor Advisories for CVE-2026-46426 (1)

Vendor Pages for CVE-2026-46426 (1)

Same Patch Batch · Budibase · 2026-05-27 · 20 CVEs total

CVE-2026-46425 9.9 CRITICAL Budibase: SCIM endpoints lack role-based authorization, BASIC users CRUD tenant users
CVE-2026-48150 9.0 CRITICAL Budibase: Workspace-scoped builder escalates to global admin via /api/public/v1/roles/assi
CVE-2026-45716 8.8 HIGH Budibase: Builder-to-Admin Privilege Escalation via onboardUsers Endpoint Without SMTP Con
CVE-2026-45717 8.8 HIGH Budibase: `PUT /api/datasources/:datasourceId` is protected only by `TABLE/READ` permissio
CVE-2026-48153 8.5 HIGH Budibase: SSRF via OAuth2 token endpoint URL reaches internal hosts and cloud metadata
CVE-2026-48149 8.1 HIGH Budibase: Stored XSS in Text component: BASIC users execute JS in admin session via Markdo
CVE-2026-48152 8.1 HIGH Budibase: Basic app users can exfiltrate stored REST datasource auth by rewriting datasour
CVE-2026-45715 7.7 HIGH Budibase: SSRF Bypass via HTTP Redirect in REST Datasource Integration
CVE-2026-46427 7.7 HIGH Budibase: Snowflake private key returned unmasked from datasource API to BASIC users
CVE-2026-48146 7.7 HIGH Budibase: SSRF via OAuth2 Config Validation — Missing fetchWithBlacklist Protection
CVE-2026-45548 7.7 HIGH Budibase: SSRF in AI Extract File Automation Step via Missing IP Blacklist Validation
CVE-2026-45061 7.7 HIGH Budibase: SSRF via trivial `.tar.gz` substring bypass in Plugin URL upload (`/api/plugin`)
CVE-2026-48151 7.5 HIGH Budibase: Webhook schema endpoint authorization bypass allows unauthenticated mutation of
CVE-2026-48147 6.5 MEDIUM Budibase: Unanchored Regex in `matchers.ts` Allows CSRF Bypass via Query String Injection
CVE-2026-45719 6.5 MEDIUM Budibase: CouchDB Reduce Injection via Unsanitized Calculation Parameter in V1 Views API
CVE-2026-45718 5.4 MEDIUM Budibase: Row Action Trigger Bypasses View Row Filter Security Boundary Allowing Action on
CVE-2026-46424 4.2 MEDIUM Budibase: Missing Cache Invalidation on Public API Role Unassignment Allows Revoked Users
CVE-2026-48128 Budibase: SSRF via User-Controlled queryId in Automation Execute Query Step
CVE-2026-48148 Budibase: Unvalidated VectorDB Host Parameter Enables SSRF

IV. Related Vulnerabilities

Same product: budibase
Same vendor: Budibase
Same weakness: CWE-79

V. Comments for CVE-2026-46426

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