CVE-2026-109300— Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds
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 在 0.6.31 至 0.11.4 版本之间存在一个存储型跨站脚本（Stored XSS）漏洞，该漏洞源于其 Markdown 渲染器。具体而言，渲染器将用户编写的“工具调用详情”代码块误判为工具输出，并将其中的 属性注入到允许执行脚本的 元素中。 已认证用户可以构造并发送包含恶意内容的频道消息、聊天消息或引用内容，当其他用户浏览这些内容时，恶意脚本将在其浏览器中执行。这可能导致应用内钓鱼攻击，或在启用 策略的情况下发生会话劫持。
Possible ATT&CK Techniques 3 AI
T1556 · Modify Authentication Process T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| open-webui | open-webui | 0.6.31< 0.11.4 |
affected |
0.11.4 |
unaffected |
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I. Basic Information for CVE-2026-109300
Vulnerability Information
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Vulnerability Title
Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI from 0.6.31 before 0.11.4 contains a stored cross-site scripting vulnerability in its Markdown renderer, which treats user-authored tool-call details blocks as tool output and mounts their embeds attribute in script-enabled iframes. Authenticated users can post crafted channel messages, chat messages, or citation content that runs JavaScript in viewers' browsers, enabling in-app phishing, or session hijacking where iframeSandboxAllowSameOrigin is enabled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| open-webui | open-webui | 0.6.31 ~ 0.11.4 | - |
|
II. Public POCs for CVE-2026-109300
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-109300 (2)
Same Patch Batch · open-webui · 2026-10-12 · 19 CVEs total
| CVE-2026-109286 | 8.1 HIGH | Open WebUI 0.7.0 before 0.11.4 Session Token Theft via SyncStatsModal |
| CVE-2026-109572 | 7.6 HIGH | Open WebUI 0.8.6 before 0.11.4 Privilege Escalation via Terminal Proxy |
| CVE-2026-109291 | 7.3 HIGH | Open WebUI 0.6.33 before 0.11.4 Stored XSS via Citation embed_url |
| CVE-2026-109290 | 7.3 HIGH | Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview |
| CVE-2026-109292 | 6.8 MEDIUM | Open WebUI 0.6.27 before 0.11.4 Session Token Disclosure via OAuth-Mode Connections |
| CVE-2026-109297 | 6.5 MEDIUM | Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automation Recurrence Rules |
| CVE-2026-109298 | 6.5 MEDIUM | Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex |
| CVE-2026-109294 | 6.5 MEDIUM | Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image |
| CVE-2026-109293 | 6.5 MEDIUM | Open WebUI 0.11.0 before 0.11.4 Tool Source Disclosure via Tool Export Endpoint |
| CVE-2026-109295 | 6.5 MEDIUM | Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop |
| CVE-2026-109299 | 6.5 MEDIUM | Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation |
| CVE-2026-109288 | 6.4 MEDIUM | Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links |
| CVE-2026-109289 | 6.3 MEDIUM | Open WebUI 0.8.8 before 0.11.4 Improper Session Revocation via Terminal WebSocket |
| CVE-2026-109283 | 5.4 MEDIUM | Open WebUI 0.11.1 before 0.11.4 Authorization Bypass via OAuth Token Exchange |
| CVE-2026-109285 | 5.0 MEDIUM | Open WebUI 0.6.0 before 0.11.4 Improper Access Control via Stale File Metadata |
| CVE-2026-109287 | 4.3 MEDIUM | Open WebUI 0.9.6 before 0.11.4 Information Disclosure via Unscoped Directory ID |
| CVE-2026-109296 | 4.3 MEDIUM | Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes |
| CVE-2026-109284 | 4.3 MEDIUM | Open WebUI 0.11.0 before 0.11.4 Improper Authorization via Chat Fork Endpoint |
IV. Related Vulnerabilities
Same product: open-webui
-
CVE-2026-109572
Open WebUI 0.8.6 before 0.11.4 Privilege Escalation via Term -
CVE-2026-109299
Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurre -
CVE-2026-109298
Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowle -
CVE-2026-109297
Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automa -
CVE-2026-109296
Open WebUI before 0.11.4 Missing Authorization via Backend I
Same vendor: open-webui
-
CVE-2026-109572
Open WebUI 0.8.6 before 0.11.4 Privilege Escalation via Term -
CVE-2026-109299
Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurre -
CVE-2026-109298
Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowle -
CVE-2026-109297
Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automa -
CVE-2026-109296
Open WebUI before 0.11.4 Missing Authorization via Backend I
Same weakness: CWE-79
-
CVE-2026-110849
n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Binar -
CVE-2026-110847
n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Chat -
CVE-2026-69194
FileRise: Unsanitized footerHtml in Public Site Config -
CVE-2026-0316
PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability -
CVE-2026-54701
Markdown Preview Enhanced: Stored XSS via Unsanitized `.cros
V. Comments for CVE-2026-109300
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