CVE-2026-54011— Open WebUI: Stored XSS in Mermaid Markdown Preview
Possible ATT&CK Techniques 3AI
T1105 · Ingress Tool Transfer T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| open-webui | open-webui | < 0.9.6 | affected |
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I. Basic Information for CVE-2026-54011
Vulnerability Information
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Vulnerability Title
Open WebUI: Stored XSS in Mermaid Markdown Preview
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6,Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working payload was validated through the Markdown preview path, resulting in JavaScript execution in the victim’s browser under the application origin. This vulnerability is fixed in 0.9.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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
Open WebUI 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.9.6之前版本存在跨站脚本漏洞，该漏洞源于应用在处理Markdown文件预览时，使用innerHTML将Mermaid生成的SVG插入DOM，且Mermaid配置了宽松的安全等级，导致攻击者控制的Mermaid内容不安全渲染，可能造成在受害者浏览器中执行JavaScript脚本。
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 |
|---|---|---|---|---|
| open-webui | open-webui | < 0.9.6 | - |
II. Public POCs for CVE-2026-54011
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 5308 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-54011
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Vendor Advisories for CVE-2026-54011 (1)
Same Patch Batch · open-webui · 2026-06-23 · 15 CVEs total
| CVE-2026-54008 | 8.5 HIGH | Open WebUI: Redirect-Bypass SSRF in OAuth `_process_picture_url` |
| CVE-2026-54010 | 8.3 HIGH | Open WebUI: Forged chat-file link allows cross-user file read and deletion |
| CVE-2026-54018 | 7.7 HIGH | Open WebUI: SSRF Protection Bypass in Playwright Web Loader via HTTP Redirects |
| CVE-2026-54013 | 7.6 HIGH | Open WebUI: Stored XSS to Account Takeover via Model Profile Images in Open WebUI |
| CVE-2026-54012 | 7.1 HIGH | Open WebUI: Forged model meta.knowledge allows cross-user file read and deletion |
| CVE-2026-54009 | 6.5 MEDIUM | Open WebUI: Cross-user file disclosure via /api/chat/completions image_url field |
| CVE-2026-54019 | 6.5 MEDIUM | Open WebUI: RAG ACL Bypass in Milvus Multitenancy Mode |
| CVE-2026-54015 | 6.4 MEDIUM | Open WebUI: Prompt history IDOR: unbound history_id allows cross-prompt read and deletion |
| CVE-2026-54021 | 6.3 MEDIUM | Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguar |
| CVE-2026-54022 | 5.3 MEDIUM | Open WebUI: Any authenticated user can read other users' private notes via Socket.IO |
| CVE-2026-54016 | 4.3 MEDIUM | Open WebUI: Open WebUI BOLA: `search_knowledge_files` Allows Unauthorized Knowledge Base F |
| CVE-2026-54006 | 4.3 MEDIUM | Open WebUI: Calendar event re-parenting allows writing events into another user's calendar |
| CVE-2026-54014 | 4.3 MEDIUM | Open WebUI: Sibling-Prefix Path Traversal via /cache/{path} in open-webui/open-webui |
| CVE-2026-54007 | Open WebUI: Cross-origin postMessage confirmation bypass via action:submit |
IV. Related Vulnerabilities
Same product: open-webui
- CVE-2026-70494
Open WebUI: A folder write-collaborator can permanently dele - CVE-2026-70493
Open WebUI: Any authenticated user can stall a worker via a - CVE-2026-70492
Open WebUI: Stored XSS via unescaped KaTeX render-error fall - CVE-2026-70491
Open WebUI: Tool source code disclosed to read-only users vi - CVE-2026-70490
Open WebUI: Unapproved accounts can open terminal sessions v
Same vendor: open-webui
- CVE-2026-70494
Open WebUI: A folder write-collaborator can permanently dele - CVE-2026-70493
Open WebUI: Any authenticated user can stall a worker via a - CVE-2026-70492
Open WebUI: Stored XSS via unescaped KaTeX render-error fall - CVE-2026-70491
Open WebUI: Tool source code disclosed to read-only users vi - CVE-2026-70490
Open WebUI: Unapproved accounts can open terminal sessions v
Same weakness: CWE-79
- CVE-2026-72743
SQLBot 1.10.0 SQText Dashboard Component Stored XSS via v-ht - CVE-2026-69116
FlyEnv < 4.18.0 Cross-Site Scripting via v-html - CVE-2026-44401
Typemill CMS 2.x Persistent XSS via Markdown javascript URI - CVE-2026-72730
Discourse: Stored XSS chat-transcript username unescaped in - CVE-2026-72729
Discourse: Stored XSS in discourse-local-dates plugin
V. Comments for CVE-2026-54011
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