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CVE-2026-48529 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.2 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CNA: [email protected]CVSS-B:6 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/github/github-mcp-server/security/advisories/GHSA-pjp5-fpmr-3349	CISA-ADP	AdvisoryExploitRemedyVendor
https://github.com/github/github-mcp-server/security/advisories/GHSA-pjp5-fpmr-3349	[email protected]	AdvisoryExploitRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-284	Improper Access Control	[email protected]

Affected Products

Product	Versions
GitHub MCP Server	>= 0.22.0, < 1.1.2 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 1.1.2moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Jun 27, 2026	CVE Modified	CISA-ADP
Jun 26, 2026	New CVE Received	[email protected]