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Sunday, 13 September 2026
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Incident database

CVE-2026-48529: GitHub MCP Server shares first user's credentials in lockdown mode

In GitHub's official MCP Server versions 0.22.0 through 1.1.1, running in HTTP mode with --lockdown-mode enabled caused the RepoAccessCache to be a process-global singleton initialized with the first authenticated user's GraphQL client, so all later users' lockdown-related GraphQL queries ran under the first user's credentials. The issue is fixed in version 1.1.2.

Disclosed 26 June 2026 · Record updated 13 September 2026

Impact

Lockdown-related GraphQL queries from subsequent users were executed with the first authenticated user's credentials, breaking per-user access control in multi-user HTTP deployments.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-48529