CVE-2026-70483

Low

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/{id} cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort that user's running model response, title generation, or tag generation, even though the delete was refused and no chat data was deleted, modified, or disclosed. This issue is fixed in 0.11.0.

SeverityLow

CVSS3.1

Exploit probability—

ProductOpenwebui Open Webui

PublishedAug 4, 2026

First seenAug 4, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

openwebui open_webui0.11.0 or later
open-webui0.11.0 or later

Affected products

Product	Affected versions	Fixed in
openwebui open_webui	0.9.6 ≤ v < 0.11.0	0.11.0
open-webuiPyPI	0.9.6 ≤ v < 0.11.0	0.11.0

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