CVE-2026-109284— Open WebUI 0.11.0 before 0.11.4 Improper Authorization via Chat Fork Endpoint
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 版本在 0.11.0 至 0.11.4 之间（不含 0.11.4）存在一个授权不当漏洞，该漏洞出现在聊天分支处理程序中。此漏洞未检查文件夹的写入权限，便将分支后的聊天置于源聊天的所在文件夹中。共享文件夹中权限被降级为只读的用户，仍可对其在拥有写入权限期间创建的聊天调用 POST /api/v1/chats/{id}/fork 接口，从而插入由攻击者控制的聊天内容，这些聊天内容对文件夹所有者和成员可见。
Affected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| open-webui | open-webui | 0.11.0< 0.11.4 |
affected |
0.11.4 |
unaffected |
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I. Basic Information for CVE-2026-109284
Vulnerability Information
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Vulnerability Title
Open WebUI 0.11.0 before 0.11.4 Improper Authorization via Chat Fork Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI from 0.11.0 before 0.11.4 contains an improper authorization vulnerability in the chat fork handler, which places forked chats in the source chat's folder without checking folder write access. Shared folder members downgraded to read-only can call POST /api/v1/chats/{id}/fork on chats they created there while they had write access, inserting attacker-controlled chats visible to the folder owner and members.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| open-webui | open-webui | 0.11.0 ~ 0.11.4 | - |
|
II. Public POCs for CVE-2026-109284
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-109284 (1)
Other References for CVE-2026-109284 (1)
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-2026-109288 | 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-2026-109296 | 4.3 MEDIUM | Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes |
| CVE-2026-109287 | 4.3 MEDIUM | Open WebUI 0.9.6 before 0.11.4 Information Disclosure via Unscoped Directory ID |
IV. Related Vulnerabilities
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CVE-2026-109572
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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
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CVE-2026-109572
Open WebUI 0.8.6 before 0.11.4 Privilege Escalation via Term -
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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
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Same weakness: CWE-862
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