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CVE-2026-48149— Budibase: Stored XSS in Text component: BASIC users execute JS in admin session via MarkdownViewer innerHTML + CDN+srcdoc CSP bypass

CVSS 8.1 · High EPSS 0.23% · P14

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
Budibasebudibase< 3.39.0affected
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I. Basic Information for CVE-2026-48149

Vulnerability Information
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Vulnerability Title
Budibase: Stored XSS in Text component: BASIC users execute JS in admin session via MarkdownViewer innerHTML + CDN+srcdoc CSP bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Budibase is an open-source low-code platform. Prior to 3.39.0, the Budibase Text component renders markdown by assigning marked.parse(markdown) straight to innerHTML with no sanitizer (packages/bbui/src/Markdown/MarkdownViewer.svelte:22). Any column a builder binds to a Text component in Markdown mode is a stored-XSS sink writable by every BASIC app user with WRITE on the underlying table. This vulnerability is fixed in 3.39.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 跨站脚本漏洞
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 3.39.0之前版本存在跨站脚本漏洞，该漏洞源于Text组件将markdown直接赋值给innerHTML且未进行清理，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

VendorProductAffected VersionsCPESubscribe
Budibasebudibase < 3.39.0 -

II. Public POCs for CVE-2026-48149

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 6138 chars
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III. Intelligence Information for CVE-2026-48149

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Vendor Advisories for CVE-2026-48149 (1)

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

CVE-2026-464259.9 CRITICALBudibase: SCIM endpoints lack role-based authorization, BASIC users CRUD tenant users
CVE-2026-481509.0 CRITICALBudibase: Workspace-scoped builder escalates to global admin via /api/public/v1/roles/assi
CVE-2026-457168.8 HIGHBudibase: Builder-to-Admin Privilege Escalation via onboardUsers Endpoint Without SMTP Con
CVE-2026-457178.8 HIGHBudibase: `PUT /api/datasources/:datasourceId` is protected only by `TABLE/READ` permissio
CVE-2026-481538.5 HIGHBudibase: SSRF via OAuth2 token endpoint URL reaches internal hosts and cloud metadata
CVE-2026-481528.1 HIGHBudibase: Basic app users can exfiltrate stored REST datasource auth by rewriting datasour
CVE-2026-464277.7 HIGHBudibase: Snowflake private key returned unmasked from datasource API to BASIC users
CVE-2026-450617.7 HIGHBudibase: SSRF via trivial `.tar.gz` substring bypass in Plugin URL upload (`/api/plugin`)
CVE-2026-481467.7 HIGHBudibase: SSRF via OAuth2 Config Validation — Missing fetchWithBlacklist Protection
CVE-2026-455487.7 HIGHBudibase: SSRF in AI Extract File Automation Step via Missing IP Blacklist Validation
CVE-2026-457157.7 HIGHBudibase: SSRF Bypass via HTTP Redirect in REST Datasource Integration
CVE-2026-464267.6 HIGHBudibase: Unrestricted Upload of File with Dangerous Type
CVE-2026-481517.5 HIGHBudibase: Webhook schema endpoint authorization bypass allows unauthenticated mutation of
CVE-2026-481476.5 MEDIUMBudibase: Unanchored Regex in `matchers.ts` Allows CSRF Bypass via Query String Injection
CVE-2026-457196.5 MEDIUMBudibase: CouchDB Reduce Injection via Unsanitized Calculation Parameter in V1 Views API
CVE-2026-457185.4 MEDIUMBudibase: Row Action Trigger Bypasses View Row Filter Security Boundary Allowing Action on
CVE-2026-464244.2 MEDIUMBudibase: Missing Cache Invalidation on Public API Role Unassignment Allows Revoked Users
CVE-2026-48128Budibase: SSRF via User-Controlled queryId in Automation Execute Query Step
CVE-2026-48148Budibase: Unvalidated VectorDB Host Parameter Enables SSRF

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-48149

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