CVE-2026-109288— Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
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 0.11.4 之前的版本在 MarkdownInlineTokens.svelte 中存在一个存储型跨站脚本（XSS）漏洞。该漏洞在未验证链接协议（scheme）的情况下，直接将 Markdown 链接的 URL 渲染为 HTML 锚点（anchor）的 href 属性。经过身份验证的用户可以在共享聊天中嵌入使用 javascript: 协议的恶意链接，当其他用户（受害者）点击该链接时，将导致受害者的 JWT（JSON Web Token）从浏览器本地存储中被窃取，其中包括管理员的令牌。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| open-webui | open-webui | < 0.11.4 |
affected |
0.11.4 |
unaffected |
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I. Basic Information for CVE-2026-109288
Vulnerability Information
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Vulnerability Title
Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme. Authenticated users can embed javascript: links in shared chats that, when clicked by a victim, steal the victim's JWT from local storage, including admins' tokens.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| open-webui | open-webui | 0 ~ 0.11.4 | - |
|
II. Public POCs for CVE-2026-109288
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-109288 (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-2026-109290 | 7.3 HIGH | Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview |
| CVE-2026-109291 | 7.3 HIGH | Open WebUI 0.6.33 before 0.11.4 Stored XSS via Citation embed_url |
| CVE-2026-109292 | 6.8 MEDIUM | Open WebUI 0.6.27 before 0.11.4 Session Token Disclosure via OAuth-Mode Connections |
| CVE-2026-109299 | 6.5 MEDIUM | Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation |
| CVE-2026-109295 | 6.5 MEDIUM | Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop |
| CVE-2026-109298 | 6.5 MEDIUM | Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex |
| CVE-2026-109297 | 6.5 MEDIUM | Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automation Recurrence Rules |
| CVE-2026-109293 | 6.5 MEDIUM | Open WebUI 0.11.0 before 0.11.4 Tool Source Disclosure via Tool Export Endpoint |
| CVE-2026-109294 | 6.5 MEDIUM | Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image |
| 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-2026-109300 | 4.6 MEDIUM | Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds |
| 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 |
| CVE-2026-109287 | 4.3 MEDIUM | Open WebUI 0.9.6 before 0.11.4 Information Disclosure via Unscoped Directory ID |
IV. Related Vulnerabilities
Same product: open-webui
-
CVE-2026-109572
Open WebUI 0.8.6 before 0.11.4 Privilege Escalation via Term -
CVE-2026-109300
Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Emb -
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
Same vendor: open-webui
-
CVE-2026-109572
Open WebUI 0.8.6 before 0.11.4 Privilege Escalation via Term -
CVE-2026-109300
Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Emb -
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
Same weakness: CWE-79
-
CVE-2026-91159
Discourse: Stored oEmbed HTML injection via allowed iframe -
CVE-2026-89069
MOVEit Transfer Stored XSS Vulnerability in Ad Hoc Packages -
CVE-2026-60008
Gitea Jupyter notebook UI redress through CSS class injectio -
CVE-2026-110627
ClipBucket v5 through 5.5.3-#206 Reflected XSS via add_todo -
CVE-2026-110626
ClipBucket v5 through 5.5.3-#206 Reflected XSS via edit_lang
V. Comments for CVE-2026-109288
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