CVE-2026-54007
Open WebUI: Cross-origin postMessage confirmation bypass via action:submit
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.
INFO
Published Date :
June 23, 2026, 4:51 p.m.
Last Modified :
June 23, 2026, 4:51 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-54007
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Open WebUI to version 0.9.6 or later.
- Verify same-origin policy is enforced for chat messages.
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CVE-2026-54007 vulnerability anywhere in the article.