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CVE-2026-87015— Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication

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 是一个可扩展、功能丰富且用户友好的自托管 AI 平台。在 0.6.27 到 0.11.1 版本中， 文件中的代码从外层连接循环中获取了 cookie jar（cookie 容器），而没有将其绑定到每个外部工具的可调用对象上。当同时挂载了多个工具服务器，并且某个会话或系统级 OAuth 连接被最后处理时，发往另一个配置为使用 Bearer 认证的服务器 的请求可能会携带当前用户的 Open WebUI 会话 Cookie，使得该服务器的运营方能够重用该会话并接管用户账户。该问题已在 0.11.1

CVSS 6.8 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-87015

Vulnerability Information
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Vulnerability Title
Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 until 0.11.1, backend/open_webui/utils/tools.py captured a cookie jar from the enclosing connection loop instead of binding it to each external tool callable. When multiple tool servers were attached and a session or system OAuth connection was processed last, a request to a different server configured for bearer authentication could include the calling user's Open WebUI session cookies, allowing that server's operator to reuse the session and take over the account. This issue is fixed in version 0.11.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-webui open-webui >= 0.6.27, < 0.11.1 -

II. Public POCs for CVE-2026-87015

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III. Intelligence Information for CVE-2026-87015

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Other References for CVE-2026-87015 (3)

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-2026-87014 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
CVE-2026-87997 4.3 MEDIUM Open WebUI: Any authenticated user can inject chats into another user's folder via chat co

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-201

V. Comments for CVE-2026-87015

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