CVE-2026-48529

mediumCVSS 6covered by 1 sourcefirst seen 2026-06-26

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.

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Exploitation outlook

Low exploitation risk0.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-48529: GitHub MCP Server is GitHub's official MCP Server. From 0.22.0 until 1.1.2, when running in HT…nvd · 2026-06-26

External references

NVD record for CVE-2026-48529

CVE.org record

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