Open WebUI: Cross-origin postMessage confirmation bypass via action:submit_CVE-2026-54007

7.1 / 10

HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, the chat message listener allows non-same-origin input:prompt and action:submit messages, so an external site can set prompt text and trigger submitPrompt() in an authenticated victim session. I validated this with a cross-origin attacker page that auto-posted messages and caused unauthorized POST /api/v1/chats/new and POST /api/chat/completions requests containing attacker-controlled prompts. This enables cross-site forced actions and model/tool execution under victim privileges without consent. This vulnerability is fixed in 0.9.6.

Basic Information

ID CVE-2026-54007

Source GitHub_M

Published Jun 23, 2026 at 16:51

Affected Product

Vendor open-webui

Product open-webui

Version < 0.9.6

Affected Versions open-webui open-webui < 0.9.6

CWE Classification

CWE-346

References

github.com /open-webui/open-webui/security/advisories/GHSA-3vv5-8xxp-4f55

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    "published": "2026-06-23T16:51:27.546Z",
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