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CVE-2026-41613 is an elevation of privilege vulnerability in Microsoft Visual Studio Code affecting the one-click installer flow for Model Context Protocol (MCP) servers. According to the provided content, the installer preview dialog displayed only five configuration fields while silently accepting additional hidden fields, including environment variables and HTTP headers. This created a UI trust-boundary failure in which a developer could approve an apparently benign MCP installation while attacker-controlled hidden parameters were still applied. One exploitation path involved setting hidden environment variables such as NODE_OPTIONS and abusing Node.js --import support for data URLs to preload attacker-supplied JavaScript before the MCP server started, which could then execute shell commands. A second path involved hidden HTTP headers that could force an HTTP-based MCP server to authenticate using attacker-supplied credentials, effectively fixing the session to the attacker’s account. Microsoft describes the issue as session fixation and states that successful exploitation can grant the attacker the permissions associated with the MCP Server’s managed identity.
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No public exploit code observed for this vulnerability.
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11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Visual Studio Code vulnerability in the one-click MCP server installer that allowed hidden fields such as environment variables and HTTP headers to be supplied without being shown in the install confirmation UI, enabling arbitrary JavaScript/code execution via NODE_OPTIONS --import and credential/session hijacking.
A Visual Studio Code vulnerability included in a cluster of fixes affecting VSCode, covering issues such as elevation of privilege, information disclosure, remote code execution, and security feature bypass. The specific flaw type for this CVE is not individually identified in the content.
A session fixation vulnerability in Visual Studio Code that allows an unauthorized attacker to elevate privileges over a network.
An elevation of privilege vulnerability in Visual Studio Code involving session fixation that can allow an unauthorized attacker over a network to gain the permissions associated with the MCP Server’s managed identity if a user opens a malicious file.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.