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.
Metrics
Affected Vendors & Products
References
History
Sun, 28 Jun 2026 13:30:00 +0000
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ssvc
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Tue, 23 Jun 2026 20:45:00 +0000
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Open-webui
Open-webui open-webui |
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Open-webui
Open-webui open-webui |
Tue, 23 Jun 2026 17:30:00 +0000
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| 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. | |
| Title | Open WebUI: Cross-origin postMessage confirmation bypass via action:submit | |
| Weaknesses | CWE-346 | |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-06-23T16:51:27.546Z
Updated: 2026-06-26T19:28:13.499Z
Reserved: 2026-06-11T16:34:11.635Z
Link: CVE-2026-54007
Updated: 2026-06-26T19:27:35.315Z
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