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CVE-2026-87997— Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions

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团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.10.0版本至0.11.1之前版本存在授权问题漏洞，该漏洞源于POST /api/chat/completions和POST /api/v1/chat/completions接口未对客户端提供的folder_id应用文件夹写访问检查，导致经过身份验证的用户可将攻击者控制的聊天注入只读或无写权限的文件夹，使该条目对授权文件夹读者可见。

CVSS 4.3 · Medium EPSS 0.37% · P31

Possible ATT&CK Techniques 1 AI

T1079

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-webui open-webui >= 0.10.0, < 0.11.1 affected
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I. Basic Information for CVE-2026-87997

Vulnerability Information
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Vulnerability Title
Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, POST /api/chat/completions and POST /api/v1/chat/completions in backend/open_webui/main.py copied a client-supplied folder_id into a new chat without applying the folder write-access check used by the dedicated chat routes. An authenticated user who knew a shared folder identifier could inject an attacker-controlled chat into a folder where the user had read-only or no write access, causing the entry to appear to authorized folder readers. This issue is fixed in version 0.11.1.
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
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.10.0版本至0.11.1之前版本存在授权问题漏洞，该漏洞源于POST /api/chat/completions和POST /api/v1/chat/completions接口未对客户端提供的folder_id应用文件夹写访问检查，导致经过身份验证的用户可将攻击者控制的聊天注入只读或无写权限的文件夹，使该条目对授权文件夹读者可见。
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 >= 0.10.0, < 0.11.1 -

II. Public POCs for CVE-2026-87997

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III. Intelligence Information for CVE-2026-87997

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Patches & Fixes for CVE-2026-87997 (2)

Vendor Advisories for CVE-2026-87997 (1)

Same Patch Batch · open-webui · 2026-09-09 · 16 CVEs total

CVE-2026-87995 8.7 HIGH Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcodin
CVE-2026-87016 8.1 HIGH Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on
CVE-2026-87996 7.7 HIGH Open WebUI: SSRF into internal services via DNS rebinding in the Playwright web loader
CVE-2026-87011 7.5 HIGH Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in bac
CVE-2026-87998 7.1 HIGH Open WebUI: Non-admin users can delete admin-owned external knowledge connections via know
CVE-2026-87999 7.1 HIGH Open WebUI: Any authenticated user can reach the Azure platform channel via server-side we
CVE-2026-87015 6.8 MEDIUM Open WebUI: A user's session cookies are sent to tool servers configured for bearer authen
CVE-2026-87014 6.5 MEDIUM Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users'
CVE-2026-88000 6.5 MEDIUM Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic ch
CVE-2026-88002 6.5 MEDIUM Open WebUI: Any authenticated user can hang the server via a cyclic chat message history
CVE-2026-88001 5.0 MEDIUM Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redi
CVE-2026-87012 4.3 MEDIUM Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-nu
CVE-2026-87013 4.3 MEDIUM Open WebUI: Any authenticated user can start a non-terminating request via a folder parent
CVE-2026-87017 4.3 MEDIUM Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool o
CVE-2026-87994 4.3 MEDIUM Open WebUI: Channel members can overwrite another member's message via the chat completion

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-639