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HighVulnerability

GHSA-6qxp-vccf-f47h: MCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server

Affected: @modelcontextprotocol/sdk >= 1.12.0, < 1.31.0, fixed in 1.31.0
@modelcontextprotocol/client >= 2.0.0, < 2.2.0, fixed in 2.2.0
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.2%

The source does not state a fix yet. Check the original advisory for updates.

CVSS score: 7.5(high)
Patch available: Yes
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: none
EPSS: 0.2%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 10, 2026.
Disclosure date: October 6, 2026

Packages: @modelcontextprotocol/sdk@>= 1.12.0, < 1.31.0 (fixed: 1.31.0)
@modelcontextprotocol/client@>= 2.0.0, < 2.2.0 (fixed: 2.2.0)
Vendors: Anthropic

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative.

First tracked: October 10, 2026 at 12:52 AM ET, from GitHub Advisory Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 85% (self-assessed)

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

@modelcontextprotocol/clientnpmNo LLM dependency detected · 2 tracked dependents
@modelcontextprotocol/sdknpmLLM dependency since 2024-11-11 · 18 tracked dependents