CVE-2026-104850

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{"affected": [{"affectedData": [{"product": "typescript-sdk", "vendor": "modelcontextprotocol", "versions": [{"status": "affected", "version": ">= 1.12.0, < 1.31.0"}, {"status": "affected", "version": ">= 2.0.0, < 2.2.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. Starting in version 1.12.0 and prior to versions 1.31.0 and 2.2.0, the SDK's OAuth client support let the MCP server a client connected to decide which authorization server received the client's OAuth credentials. Stored and pre-provisioned credentials were not bound to the authorization server they belong to. A malicious or compromised MCP server could name its own authorization server in its protected resource metadata. Without any user interaction, the client would send that server the `refresh_token` and `client_secret` stored from an earlier sign-in (1.x), or the configured `client_secret` or signed assertion of a bundled non-interactive provider (1.x and 2.x). Only those applications that use the SDK as an MCP client over HTTP with an `authProvider`: your own `OAuthClientProvider`, or the bundled `ClientCredentialsProvider`, `PrivateKeyJwtProvider`, `StaticPrivateKeyJwtProvider` or (2.x) `CrossAppAccessProvider` and that may connect to an MCP server the owners does not fully trust while holding credentials for a legitimate authorization server are affected. `@modelcontextprotocol/sdk` 1.31.0 (1.x) and `@modelcontextprotocol/client` 2.2.0 (2.x) patch the issue. A workaround for those who cannot upgrade is available. 2.0.0 and 2.1.0 already accept `expectedIssuer`. On 1.x, the only workaround is to connect OAuth-enabled clients only to MCP servers you trust."}], "id": "CVE-2026-104850", "lastModified": "2026-10-06T20:03:40.690", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-104850", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-06T16:28:43.638595Z", "version": "2.0.3"}}]}, "published": "2026-10-06T17:17:15.827", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/modelcontextprotocol/typescript-sdk/commit/edd12e282620ebf770d67316f19cf91d4112a1bd"}, {"source": "security-advisories@github.com", "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2887"}, {"source": "security-advisories@github.com", "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/v2.2.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-6qxp-vccf-f47h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-345"}, {"lang": "en", "value": "CWE-522"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "@modelcontextprotocol/sdk: @modelcontextprotocol/client: MCP TypeScript SDK: Information disclosure via unbound OAuth credentials", "id": "2546663", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546663"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-941", "details": ["A flaw was found in the Model Context Protocol (MCP) TypeScript SDK. A malicious or compromised MCP server can trigger an information disclosure vulnerability by specifying an arbitrary authorization server in its metadata. Because the client implementation fails to bind stored credentials to their designated authorization server, connecting to an untrusted server causes the client to forward sensitive OAuth tokens and secrets without user interaction."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-104850", "package_state": [{"cpe": "cpe:/a:redhat:migration_toolkit_applications:8", "fix_state": "Affected", "package_name": "mta/mta-solution-server-rhel9", "product_name": "Migration Toolkit for Applications 8"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-27/mcp-server-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-tech-preview/mcp-server-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "goose", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "goose", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana12.4", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.1", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.2", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/code-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}], "public_date": "2026-10-06T16:08:21Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-104850\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-104850\nhttps://github.com/modelcontextprotocol/typescript-sdk/commit/edd12e282620ebf770d67316f19cf91d4112a1bd\nhttps://github.com/modelcontextprotocol/typescript-sdk/pull/2887\nhttps://github.com/modelcontextprotocol/typescript-sdk/releases/tag/v2.2.0\nhttps://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-6qxp-vccf-f47h"], "statement": "Red Hat rates this vulnerability as an Important severity because it allows a malicious endpoint to silently extract sensitive authentication secrets and tokens over the network without requiring user interaction. The exposure specifically affects environments where Model Context Protocol client components establish HTTP connections to untrusted external servers while configured with OAuth authentication providers. Workloads communicating exclusively over local standard input/output channels or connecting only to verified, trustworthy endpoints are not susceptible to credential exfiltration.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.12.0,1.31.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0,2.2.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "typescript-sdk", "source": "cna", "vendor": "modelcontextprotocol"}, "product": "typescript-sdk", "vendor": "modelcontextprotocol"}], "created": "2026-10-06T18:15:04.038373+00:00", "updated": "2026-10-07T14:00:17.042002+00:00", "vendors": ["modelcontextprotocol", "modelcontextprotocol$PRODUCT$typescript-sdk"]}