| Component | Open WebUI |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| Published (NVD) | 2026-06-23 |
| Last modified | 2026-06-26 |
| Affected versions | open_webui < 0.9.6 |
| Fixed in | 0.9.6 |
| Weakness | CWE-346 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade Open WebUI to
0.9.6or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
Read more
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