{"id":"EUVD-2026-117802","revision":null,"records":[{"revision":"dfb681f90ff944da93930f0b8c18ec11","observedAt":"2026-11-05T22:36:54.207+00:00","statement":{"source":"cve-program","id":"CVE-2026-111769","aliases":[],"title":"Model Context Protocol TypeScript SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies","description":"The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP client transports and OAuth client requests followed redirects to a different origin while retaining custom request headers and, for HTTP 307 or 308 responses, request bodies. The affected surfaces are StreamableHTTPClientTransport, SSEClientTransport, and OAuth client functions such as auth(). The trigger is an HTTP redirect to another origin. Custom headers and mcp-session-id can be re-sent to the redirected origin. HTTP 307 and 308 redirects can also re-send the request body. OAuth request bodies can contain refresh_token and client_secret values. Current runtimes already strip the Authorization header across origins. stdio clients do not use the affected HTTP path. A malicious or compromised MCP or authorization server could therefore receive API keys, session identifiers, OAuth refresh tokens, or OAuth client secrets. Restoring unrestricted redirect following after upgrading restores the exposure. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/client 2.3.0.","state":0,"publishedAt":"2026-11-05T21:19:36.708+00:00","modifiedAt":"2026-11-05T21:19:36.708+00:00","affected":[{"ecosystem":"Vendor product","name":"typescript-sdk","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"modelcontextprotocol\",\n                    \"product\": \"typescript-sdk\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.32.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"sdk","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"@modelcontextprotocol\",\n                    \"product\": \"sdk\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.32.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"client","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"@modelcontextprotocol\",\n                    \"product\": \"client\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.0.0, < 2.3.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-6prh-2h8m-c8cw","https://github.com/modelcontextprotocol/typescript-sdk/pull/2901","https://github.com/modelcontextprotocol/typescript-sdk/pull/2902","https://github.com/modelcontextprotocol/typescript-sdk/commit/30bfe5139f4b0825c90cd725f9a7e3f9af5e120d","https://github.com/modelcontextprotocol/typescript-sdk/commit/433eb413dc305ebeb93b8ebcde0095a8fc0d5fa0","https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0","https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111769","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-111769","identifiers":["CVE-2026-111769"]},"retained":false,"historicalAffected":[]},{"revision":"dc93b18bb9d54cf89998471b8edb95c4","observedAt":"2026-11-07T04:33:03.743+00:00","statement":{"source":"euvd","id":"EUVD-2026-117802","aliases":["CVE-2026-111769","GHSA-6prh-2h8m-c8cw"],"title":"The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP…","description":"The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP client transports and OAuth client requests followed redirects to a different origin while retaining custom request headers and, for HTTP 307 or 308 responses, request bodies. The affected surfaces are StreamableHTTPClientTransport, SSEClientTransport, and OAuth client functions such as auth(). The trigger is an HTTP redirect to another origin. Custom headers and mcp-session-id can be re-sent to the redirected origin. HTTP 307 and 308 redirects can also re-send the request body. OAuth request bodies can contain refresh_token and client_secret values. Current runtimes already strip the Authorization header across origins. stdio clients do not use the affected HTTP path. A malicious or compromised MCP or authorization server could therefore receive API keys, session identifiers, OAuth refresh tokens, or OAuth client secrets. Restoring unrestricted redirect following after upgrading restores the exposure. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/client 2.3.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","score":6.5,"severity":null}],"references":["https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-6prh-2h8m-c8cw","https://github.com/modelcontextprotocol/typescript-sdk/pull/2901","https://github.com/modelcontextprotocol/typescript-sdk/pull/2902","https://github.com/modelcontextprotocol/typescript-sdk/commit/30bfe5139f4b0825c90cd725f9a7e3f9af5e120d","https://github.com/modelcontextprotocol/typescript-sdk/commit/433eb413dc305ebeb93b8ebcde0095a8fc0d5fa0","https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0","https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-117802","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Nov 5, 2026, 9:19:36 PM","dateUpdated":"Nov 5, 2026, 9:19:36 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-117802","identifiers":["EUVD-2026-117802","CVE-2026-111769","GHSA-6prh-2h8m-c8cw"]},"retained":false,"historicalAffected":[]},{"revision":"b29f9396a011425f9dd7312950430404","observedAt":"2026-11-06T09:36:27.137+00:00","statement":{"source":"nvd","id":"CVE-2026-111769","aliases":[],"title":"The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP…","description":"The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP client transports and OAuth client requests followed redirects to a different origin while retaining custom request headers and, for HTTP 307 or 308 responses, request bodies. The affected surfaces are StreamableHTTPClientTransport, SSEClientTransport, and OAuth client functions such as auth(). The trigger is an HTTP redirect to another origin. Custom headers and mcp-session-id can be re-sent to the redirected origin. HTTP 307 and 308 redirects can also re-send the request body. OAuth request bodies can contain refresh_token and client_secret values. Current runtimes already strip the Authorization header across origins. stdio clients do not use the affected HTTP path. A malicious or compromised MCP or authorization server could therefore receive API keys, session identifiers, OAuth refresh tokens, or OAuth client secrets. Restoring unrestricted redirect following after upgrading restores the exposure. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/client 2.3.0.","state":0,"publishedAt":"2026-11-05T22:17:45.637+00:00","modifiedAt":"2026-11-05T22:17:45.637+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/modelcontextprotocol/typescript-sdk/commit/30bfe5139f4b0825c90cd725f9a7e3f9af5e120d","https://github.com/modelcontextprotocol/typescript-sdk/commit/433eb413dc305ebeb93b8ebcde0095a8fc0d5fa0","https://github.com/modelcontextprotocol/typescript-sdk/pull/2901","https://github.com/modelcontextprotocol/typescript-sdk/pull/2902","https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0","https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0","https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-6prh-2h8m-c8cw"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-111769","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Received","weaknesses":["CWE-200"],"productCriteria":[],"sourceDates":{"published":"2026-11-05T22:17:45.637","lastModified":"2026-11-05T22:17:45.637"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-111769","identifiers":["CVE-2026-111769"]},"retained":false,"historicalAffected":[]},{"revision":"2a342a71446e4054818cdea6a1e54e2f","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-6prh-2h8m-c8cw","aliases":["CVE-2026-111769"],"title":"MCP TypeScript client SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies","description":"### Summary\nIn affected versions, the SDK's HTTP client transports and OAuth requests followed redirects to any origin.\n\nIf an MCP server or authorization server redirected a request to another origin, that origin received custom request headers (such as an `X-API-Key` set in `requestInit.headers`) and the `mcp-session-id` header. On a `307` or `308` it also received the request body, including OAuth token requests with their `refresh_token` and `client_secret`.\n\nOn current runtimes `fetch` already drops the `Authorization` header across origins.\n\n### Am I affected?\nYes, if your application uses `StreamableHTTPClientTransport`, `SSEClientTransport`, or the SDK's OAuth client functions such as `auth()`. stdio clients are not affected.\n\nAffected versions:\n\n- `@modelcontextprotocol/sdk` all versions through 1.31.0\n- `@modelcontextprotocol/client` 2.0.0 through 2.2.0\n\n### Fix\nUpgrade to:\n\n- 1.x: `@modelcontextprotocol/sdk` 1.32.0 or later\n- 2.x: `@modelcontextprotocol/client` 2.3.0 or later\n\nRedirects are now followed only within the same origin, and not at all in browsers. If your MCP server or authorization server redirects to another origin on purpose, configure the final URL instead. Setting `redirectPolicy: 'follow'` on a transport restores the old behaviour and the exposure.\n\nIf a redirect may have reached a host you do not control, rotate the API keys and `client_secret` your application held and revoke its tokens.\n\nIf you cannot upgrade yet, pass a `fetch` that refuses redirects, for example `(url, init) => fetch(url, { ...init, redirect: 'error' })`.","state":0,"publishedAt":"2026-10-20T18:26:30+00:00","modifiedAt":"2026-10-20T18:45:09.4651044+00:00","affected":[{"ecosystem":"npm","name":"@modelcontextprotocol/sdk","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.32.0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@modelcontextprotocol/client","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.0.0"},{"kind":"fixed","version":"2.3.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-6prh-2h8m-c8cw","https://github.com/modelcontextprotocol/typescript-sdk/pull/2901","https://github.com/modelcontextprotocol/typescript-sdk/pull/2902","https://github.com/modelcontextprotocol/typescript-sdk/commit/30bfe5139f4b0825c90cd725f9a7e3f9af5e120d","https://github.com/modelcontextprotocol/typescript-sdk/commit/433eb413dc305ebeb93b8ebcde0095a8fc0d5fa0","https://github.com/modelcontextprotocol/typescript-sdk"],"sourceUrl":"https://github.com/advisories/GHSA-6prh-2h8m-c8cw","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-6prh-2h8m-c8cw","identifiers":["GHSA-6prh-2h8m-c8cw","CVE-2026-111769"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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