{"action":"Upgrade @modelcontextprotocol/server-legacy to 2.3.1 or later.","affected":[{"fixed":"2.3.1","introduced":"2.0.0"}],"component":"@modelcontextprotocol/server-legacy","cve_ids":["CVE-2026-111771"],"ecosystem":"npm","exploited":false,"fixed_versions":["2.3.1"],"ghsa_id":"GHSA-rvq5-wwqv-78pq","id":"tcs_01M5KGA1EWYZPE0FQ3V3C6SYPR","modified_at":"2026-10-20T20:00:04.595309934Z","published_at":"2026-10-20T19:43:36Z","references":["https://osv.dev/vulnerability/GHSA-rvq5-wwqv-78pq","https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-rvq5-wwqv-78pq","https://github.com/modelcontextprotocol/typescript-sdk/commit/40f8f4e229d963cd7fd2890bda2aeebe7005299a","https://github.com/modelcontextprotocol/typescript-sdk/commit/5a0724d14cf34a27a3b070224d2996cdd611df9f","https://github.com/modelcontextprotocol/typescript-sdk/commit/5a1867390b91b8836f49af76c45427279f513325","https://github.com/modelcontextprotocol/typescript-sdk"],"severity":{"label":"medium","score":6.8},"sources":[{"source":"osv","source_id":"GHSA-rvq5-wwqv-78pq#npm/@modelcontextprotocol/server-legacy","url":"https://osv.dev/vulnerability/GHSA-rvq5-wwqv-78pq"}],"summary":"MCP TypeScript SDK: Server bearer authentication accepted tokens issued for another service"}