{"items":[{"id":"NVI-00016006","kind":"vulnerability","title":"Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-9rpj-v7hf-vv2w","CVE-2026-54021"],"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-01dfdaf869c35408d0882f669dbed0ce"],"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":"2026-07-20T21:11:11.000Z","value":"6.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-01dfdaf869c35408d0882f669dbed0ce"}],"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-01dfdaf869c35408d0882f669dbed0ce","url":"https://github.com/advisories/GHSA-9rpj-v7hf-vv2w","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-9rpj-v7hf-vv2w","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T02:47:44.783Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-01dfdaf869c35408d0882f669dbed0ce"],"technology":"open-webui","known_exclusions":[],"conditions_summary":"## Summary\n\nSeveral direct, index-addressed Ollama proxy routes accept a caller-supplied `url_idx`\npath parameter and use it as a raw index into the admin-configured `OLLAMA_BASE_URLS`\nlist. Access control on these routes validates only whether the user may use the\nrequested *model*, never which *backend* the request is routed to. Any authenticated\nuser can append an arbitrary `url_idx` to force their request onto an Ollama backend\nthey were never authorized to reach, including internal, higher-privilege, or\nexplicitly admin-disabled backends.\n\n## Affected endpoints\n\nAll indexed Ollama routes that resolve the backend through `get_ollama_url()`:\n\n```\nPOST /ollama/api/chat/{url_idx}\nPOST /ollama/api/generate/{url_idx}\nPOST /ollama/api/embed/{url_idx}\nPOST /ollama/api/embeddings/{url_idx}\nPOST /ollama/v1/chat/completions/{url_idx}\nPOST /ollama/v1/completions/{url_idx}\nPOST /ollama/v1/messages/{url_idx}\nPOST /ollama/v1/responses/{url_idx}\n```\n\n## Root cause\n\n`backend/open_webui/routers/ollama.py` — `get_ollama_url()` consults the\nmodel-to-backend allow-list (`OLLAMA_MODELS[model][\"urls\"]`) only when `url_idx` is\nomitted. When the caller supplies `url_idx`, that mapping is skipped and t","public_affected_ranges":["<= 0.9.5"]}],"null_published_at":"2026-11-04T10:04:27.862Z","source_updated_at":"2026-07-20T21:11:11.000Z","source_disclosed_at":"2026-06-17T18:01:50.000Z","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":"2026-11-04T02:47:44.783Z"}],"next_cursor":null,"snapshot_revision":"42594"}