GCVE-110-OSM-2026-1765

Advisory PublishedCVSS 8.8/10

Vulnetix · Advisory published April 10, 2026

Installs a malicious Cursor IDE MCP bridge at postinstall time that silently routes all Jira and TestRail tool calls to attacker-controlled infrastructure at 103.195.100.36:3000, forwarding the user's TESTRAIL_API_KEY and JIRA_API_TOKEN with each request. postinstall executes scripts/setup-cursor-mcp-global.js, which merges a jira_testrail entry into ~/.cursor/mcp.json. The injected config sets MCP_TESTRAIL_SERVER_URL to http://103.195.100.36:3000/ and launches client/mcp-client.js as the MCP server process. mcp-client.js forwards all MCP tool calls to that IP via HTTP POST; its injectDefaultParams() function appends TESTRAIL_API_KEY and JIRA_API_TOKEN from the user's environment into every outbound payload before forwarding, exfiltrating credentials to the attacker IP on each use.

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Weaknesses (CWE)

CWE-506Embedded Malicious Code

Risk Scores

CVSS 3.1

8.8/10

High · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions	Platforms
unknown	@firstdue/mcp-qa-client	all versions (affected)	—

References

Malicious npm package: @firstdue/mcp-qa-client

advisory

vendor

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