{"items":[{"id":"NVI-00017763","kind":"vulnerability","title":"Open WebUI vulnerable to Stored XSS via iFrame embeds in response messages","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-vjm7-m4xh-7wrc","CVE-2026-26193"],"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-018ce4021355e1d2053b46b4668d28b0"],"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":"2026-07-07T16:51:23.000Z","value":"7.3 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5d99867e9b7a935b432932e39f4a64fb"},{"kind":"EPSS","as_of":"2026-11-06T12:00:23.000Z","value":"0.233%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.14277. Missing scores are unknown.","source_id":"sr-018ce4021355e1d2053b46b4668d28b0"}],"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-5d99867e9b7a935b432932e39f4a64fb","url":"https://github.com/advisories/GHSA-vjm7-m4xh-7wrc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-vjm7-m4xh-7wrc","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T23:34:51.634Z"},{"id":"sr-018ce4021355e1d2053b46b4668d28b0","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-26193","publisher":"FIRST EPSS","observed_at":"2026-11-06T20:58:43.526Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5d99867e9b7a935b432932e39f4a64fb"],"technology":"open-webui","known_exclusions":[],"conditions_summary":"### Summary\nManually modifying chat history allows setting the `embeds` property on a response message, the content of which is loaded into an iFrame with a sandbox that has `allow-scripts` and `allow-same-origin` set, ignoring the \"iframe Sandbox Allow Same Origin\" configuration. This enables stored XSS on the affected chat. This also triggers when the chat is in the shared format. The result is a shareable link containing the payload that can be distributed to any other users on the instance.\n\n### Details\nThe flaw stems from how iFrames are constructed here:\nhttps://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/ResponseMessage.svelte#L689-L703\n\n`messages.embeds` is a user controlled property and so can be arbitrarily set by the user to a payload of their choosing. Since `allowScripts` and `allowSameOrigin` are harcoded as true here the sandboxing offers essentially no protection.\n\n### PoC\nCreate an arbitrary chat:\n\nEdit the model response:\n<img width=\"632\" height=\"192\" alt=\"image\" src=","public_affected_ranges":["<= 0.6.43"]}],"null_published_at":"2026-11-07T22:29:26.081Z","source_updated_at":"2026-07-07T16:51:23.000Z","source_disclosed_at":"2026-07-07T16:51:22.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-04T23:34:51.634Z"},{"id":"NVI-00017763","kind":"vulnerability","title":"Open WebUI vulnerable to Stored XSS via iFrame embeds in response messages","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-vjm7-m4xh-7wrc","CVE-2026-26193"],"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-5d99867e9b7a935b432932e39f4a64fb"],"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":"2026-07-07T16:51:23.000Z","value":"7.3 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5d99867e9b7a935b432932e39f4a64fb"}],"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-5d99867e9b7a935b432932e39f4a64fb","url":"https://github.com/advisories/GHSA-vjm7-m4xh-7wrc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-vjm7-m4xh-7wrc","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T23:34:51.634Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5d99867e9b7a935b432932e39f4a64fb"],"technology":"open-webui","known_exclusions":[],"conditions_summary":"### Summary\nManually modifying chat history allows setting the `embeds` property on a response message, the content of which is loaded into an iFrame with a sandbox that has `allow-scripts` and `allow-same-origin` set, ignoring the \"iframe Sandbox Allow Same Origin\" configuration. This enables stored XSS on the affected chat. This also triggers when the chat is in the shared format. The result is a shareable link containing the payload that can be distributed to any other users on the instance.\n\n### Details\nThe flaw stems from how iFrames are constructed here:\nhttps://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/ResponseMessage.svelte#L689-L703\n\n`messages.embeds` is a user controlled property and so can be arbitrarily set by the user to a payload of their choosing. Since `allowScripts` and `allowSameOrigin` are harcoded as true here the sandboxing offers essentially no protection.\n\n### PoC\nCreate an arbitrary chat:\n\nEdit the model response:\n<img width=\"632\" height=\"192\" alt=\"image\" src=","public_affected_ranges":["<= 0.6.43"]}],"null_published_at":"2026-11-05T19:10:21.465Z","source_updated_at":"2026-07-07T16:51:23.000Z","source_disclosed_at":"2026-07-07T16:51:22.000Z","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":"2026-11-04T23:34:51.634Z"}],"next_cursor":null,"snapshot_revision":"42594"}