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CVE-2026-45315— Open WebUI: Stored XSS via attacker-controlled file extension in /api/v1/audio/transcriptions

Quick assessment

Affected
open-webui open-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open WebUI是Open WebUI开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.9.3之前版本存在跨站脚本漏洞，该漏洞源于音频转录上传端点从用户提供的文件名中获取文件扩展名并将文件保存在CACHE_DIR/audio/transcriptions/..下，且/cache/{path}路由通过FileResponse提供这些文件，设置Content-Type为磁盘扩展名且不发出Content-Disposition，可能导致已验证用户上传多语言WAV+HTML

CVSS 8.7 · High EPSS 0.19% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-webui open-webui < 0.9.3 affected
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I. Basic Information for CVE-2026-45315

Vulnerability Information
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Vulnerability Title
Open WebUI: Stored XSS via attacker-controlled file extension in /api/v1/audio/transcriptions
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the audio transcription upload endpoint takes the file extension from the user-supplied filename and saves the file under CACHE_DIR/audio/transcriptions/.. The /cache/{path} route serves these files via FileResponse, which sets Content-Type from the on-disk extension and emits no Content-Disposition. A verified user with the default-on chat.stt permission can upload a polyglot WAV+HTML file named pwn.html and trick any other user into opening the resulting URL — the response comes back as text/html and any embedded <script> runs in the Open WebUI origin. This vulnerability is fixed in 0.9.3.
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 0.9.3之前版本存在跨站脚本漏洞，该漏洞源于音频转录上传端点从用户提供的文件名中获取文件扩展名并将文件保存在CACHE_DIR/audio/transcriptions/..下，且/cache/{path}路由通过FileResponse提供这些文件，设置Content-Type为磁盘扩展名且不发出Content-Disposition，可能导致已验证用户上传多语言WAV+HTML
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 < 0.9.3 -

II. Public POCs for CVE-2026-45315

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III. Intelligence Information for CVE-2026-45315

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Vendor Advisories for CVE-2026-45315 (1)

Same Patch Batch · open-webui · 2026-05-15 · 59 CVEs total

CVE-2026-44551 9.1 CRITICAL Open WebUI: LDAP Empty Password Authentication Bypass
CVE-2026-45672 8.8 HIGH Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature g
CVE-2026-44552 8.7 HIGH Open WebUI: Redis Cache Keys tool_servers and terminal_servers Missing Instance Prefix Ena
CVE-2026-45331 8.5 HIGH Open WebUI: Full SSRF Vulnerability in the RAG Web Search Feature
CVE-2026-45401 8.5 HIGH Open WebUI: SSRF Bypass via HTTP Redirect Following in Web-Fetch and Image-Load Endpoints
CVE-2026-45400 8.5 HIGH Open WebUI: Server-Side Request Forgery (SSRF) bypass in `validate_url`
CVE-2026-44570 8.3 HIGH Open WebUI: Inconsistent authorization controls within memories API
CVE-2026-44565 8.1 HIGH Open WebUI: Open WebUI Arbitrary File Write, Delete via Path Traversal
CVE-2026-45301 8.1 HIGH Open WebUI: Missing permission check in files API allows authenticated users to list, acce
CVE-2026-45402 8.1 HIGH Open WebUI: Cross-User File Access via Unchecked file_id in Folder Knowledge and Knowledge
CVE-2026-45675 8.1 HIGH Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts
CVE-2026-45665 8.1 HIGH Open WebUI: Stored XSS in Banner Component via Improper Sanitization Order
CVE-2026-44553 8.1 HIGH Open WebUI: Stale Admin Role in Socket.IO Session Pool Enables Post-Demotion Cross-User No
CVE-2026-44554 8.1 HIGH Open WebUI: Knowledge Base Destruction and RAG Poisoning via Unauthorized Collection Overw
CVE-2026-45671 8.0 HIGH Open WebUI: shared-chat branch ignores access_type, allowing unauthorized file deletion
CVE-2026-45303 7.7 HIGH Open WebUI: Stored XSS via the HTML renedering view
CVE-2026-45338 7.7 HIGH Open WebUI: SSRF via OAuth Profile Picture URL in _process_picture_url (oauth.py)
CVE-2026-44555 7.6 HIGH Open WebUI: Base Model Routing Bypasses Access Control via Model Chaining
CVE-2026-45398 7.5 HIGH Open WebUI: IDOR - Retrieval API Bypasses Knowledge Base Access Controls
CVE-2026-44721 7.3 HIGH Open WebUI: Stored XSS via Model Description

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-79

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