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CVE-2026-109296— Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes

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 0.11.4 版本之前存在一个缺失授权验证的漏洞。攻击者可通过提供明确的后端索引（backend index），绕过访问控制，访问已被禁用的模型提供程序后端。具体而言，攻击者可在与 Ollama 和 OpenAI 兼容的列出模型路由中，将索引作为路径段或查询参数传入，从而触发携带已配置 API 密钥的请求，读取版本字符串，并枚举可用的后端连接。

CVSS 4.3 · Medium EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
open-webui open-webui < 0.11.4 affected
0.11.4 unaffected
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I. Basic Information for CVE-2026-109296

Vulnerability Information
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Vulnerability Title
Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI before 0.11.4 contains a missing authorization vulnerability that allows authenticated users to reach disabled model provider backends by supplying an explicit backend index. Attackers can pass the index as a path segment or query parameter on Ollama and OpenAI-compatible listing routes to trigger requests carrying configured API keys, read version strings, and enumerate connections.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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-2026-109296

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III. Intelligence Information for CVE-2026-109296

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Vendor Advisories for CVE-2026-109296 (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-2026-109293 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Tool Source Disclosure via Tool Export Endpoint
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-2026-109295 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-2026-109300 4.6 MEDIUM Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds
CVE-2026-109287 4.3 MEDIUM Open WebUI 0.9.6 before 0.11.4 Information Disclosure via Unscoped Directory ID
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
Same vendor: open-webui
Same weakness: CWE-639

V. Comments for CVE-2026-109296

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