{"items":[{"id":"NVI-00013884","kind":"vulnerability","title":"PraisonAI has an origin validation bypass in MCP HTTP Stream transport that allows browser-mediated unauthenticated tool execution on local MCP server","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-wj6g-v78p-6fx3","CVE-2026-55529"],"plain_summary":"GitHub lists this reviewed advisory for PraisonAI. 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-1626e45171c1865492cf3794413229ae"],"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":"2026-08-25T14:26:27.000Z","value":"6.9 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1626e45171c1865492cf3794413229ae"}],"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-1626e45171c1865492cf3794413229ae","url":"https://github.com/advisories/GHSA-wj6g-v78p-6fx3","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-wj6g-v78p-6fx3","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T09:56:37.775Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1626e45171c1865492cf3794413229ae"],"technology":"PraisonAI","known_exclusions":[],"conditions_summary":"### Summary\n\nPraisonAI's MCP HTTP Stream transport uses an unsafe prefix match when validating the `Origin` header. The default localhost allowlist includes origins such as `http://localhost`, and the validation accepts any origin that starts with an allowed value.\n\nAs a result, an attacker-controlled origin such as `http://localhost.evil.example` passes the localhost origin check.\n\nWhen the MCP HTTP Stream server is started without an API key, which is the CLI default, this allows a malicious webpage to trigger unauthenticated MCP `tools/call` requests against a locally running PraisonAI MCP server.\n\nThis is best framed as a browser-mediated localhost attack / DNS-rebinding-style Origin validation bypass. The default server binds to `127.0.0.1`, so this is not a directly internet-facing unauthenticated API in the default configuration.\n\n### Details\n\nRelevant source locations:\n\n- `src/praisonai/praisonai/mcp_server/cli.py`\n- `src/praisonai/praisonai/mcp_server/transports/http_stream.py`\n- `src/praisonai/praisonai/mcp_server/server.py`\n- `src/praisonai/praisonai/mcp_server/adapters/__init__.py`\n- `src/praisonai/praisonai/mcp_server/adapters/extended_capabilities.py`\n- `src/praisonai","public_affected_ranges":["< 4.6.58"]}],"null_published_at":"2026-11-02T10:00:37.168Z","source_updated_at":"2026-08-25T14:26:27.000Z","source_disclosed_at":"2026-08-25T14:26:26.000Z","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":"2026-11-02T09:56:37.775Z"}],"next_cursor":null,"snapshot_revision":"42594"}