{"items":[{"id":"NVI-00015087","kind":"vulnerability","title":"Open WebUI: Cross-origin postMessage confirmation bypass via action:submit","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-3vv5-8xxp-4f55","CVE-2026-54007"],"plain_summary":"GitHub lists this reviewed advisory for open-webui. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-1d6653b326179a4cd098833400ca50da"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-08-13T13:45:01.000Z","value":"6.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1d6653b326179a4cd098833400ca50da"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-1d6653b326179a4cd098833400ca50da","url":"https://github.com/advisories/GHSA-3vv5-8xxp-4f55","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-3vv5-8xxp-4f55","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T20:16:47.162Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1d6653b326179a4cd098833400ca50da"],"technology":"open-webui","known_exclusions":[],"conditions_summary":"### Summary\n\nThe 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.\n\n### Details\n\nThe chat page's window message listener in `src/lib/components/chat/Chat.svelte` processes message types including `input:prompt` and `action:submit` without adequately enforcing same-origin restrictions. Based on code around lines ~597-616, input text is set directly from `event.data.text`; `action:submit` proceeds to `submitPrompt()` on the current prompt. The logic does not apply a strict origin allowlist and permits non-same-origin control of the chat input and submission flow, leading to cross-origin command execution in the victim's authenticated UI context. As a result, backend API calls (e.g., `POST /api/v1/chats/new`, `POST /api/chat/completion","public_affected_ranges":["<= 0.9.5"]}],"null_published_at":"2026-11-03T10:03:26.546Z","source_updated_at":"2026-08-13T13:45:01.000Z","source_disclosed_at":"2026-06-17T14:10:35.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T20:16:47.162Z"}],"next_cursor":null,"snapshot_revision":"42594"}