---
id: CVE-2026-87015
title: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform
summary: >-
  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
  exte…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-201
vendor: openwebui
product: open_webui
affected:
  - 'open_webui >= 0.6.27, < 0.11.1'
patched:
  - open_webui 0.11.1
published: '2026-09-09'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T15:54:14.750'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87015'
references:
  - url: >-
      https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/pull/28630'
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/releases/tag/v0.11.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00287
epssPercentile: 0.21512
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T13:50:14.302791Z'
ingestedAt: '2026-09-13T02:39:38.847Z'
---

## Overview

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.

## Affected

- `open_webui >= 0.6.27, < 0.11.1`

## Remediation

Upgrade past the affected range:

- `open_webui 0.11.1`