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Change History

https://github.com/github/github-mcp-server/security/advisories/GHSA-pjp5-fpmr-3349

{"timestamp":"2026-06-27T02:42:44.775898Z","id":"CVE-2026-48529","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

GitHub MCP Server is GitHub's official MCP Server. From 0.22.0 until 1.1.2, when running in HTTP mode with --lockdown-mode enabled, the RepoAccessCache is implemented as a process-global singleton initialized with the first authenticated user's GraphQL client. All subsequent requests from different users share this singleton and their lockdown-related GraphQL queries are executed using the first user's credentials. The singleton is never updated to reflect later users' tokens. This vulnerability is fixed in 1.1.2.

AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

CWE-284

https://github.com/github/github-mcp-server/security/advisories/GHSA-pjp5-fpmr-3349

[{"vendor":"github","product":"github-mcp-server","versions":[{"version":">= 0.22.0, < 1.1.2","status":"affected"}]}]