CVE-2026-48529
- Source
- https://cve.org/CVERecord?id=CVE-2026-48529
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-48529.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-48529
- Aliases
- Downstream
- Related
- Published
- 2026-06-26T16:33:32Z
- Modified
- 2026-10-16T02:57:56Z
- Severity
-
- 6.0 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L CVSS Calculator
- Summary
- GitHub MCP Server: Lockdown mode singleton in HTTP server causes cross-user GraphQL client confusion
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-284" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48529.json" }- References
Affected packages
Git / github.com/github/github-mcp-server
Affected ranges
- Type
- GIT
- Repo
- https://github.com/github/github-mcp-server
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0.22.0" }, { "fixed": "1.1.2" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "introduced": "0" }, { "fixed": "1.1.2" } ], "source": "DESCRIPTION" } ] }