Is CVE-2026-48529 actively exploited?

No active exploitation of CVE-2026-48529 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-48529 be exploited remotely?

Yes. CVE-2026-48529 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-48529?

CVE-2026-48529 has a CVSS score of 6.0 (MEDIUM).

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MEDIUM

CVE-2026-48529

CWE-284Published: June 26, 2026· Updated: Jun 27, 2026

6.0

CVSS v3.1

EPSS:0.21%probability of exploitation in 30 daysPercentile:10.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-48529 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.