CVE-2026-87997

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductOpenwebui Open Webui

PublishedSep 9, 2026

First seenSep 9, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key CWE-862Missing authorization

How to fix

Update

openwebui open_webui0.11.1 or later
open-webui0.11.1 or later

Affected products

Product	Affected versions	Fixed in
openwebui open_webui	0.10.0 ≤ v < 0.11.1	0.11.1
open-webuiPyPI	0.10.0 ≤ v < 0.11.1	0.11.1

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