GHSA-p6hp-93wp-fh6p: MCP Atlassian: Path Traversal / Arbitrary File Read in confluence_upload_attachment MCP tool (incomplete fix of GHSA-xjgw-4wvw-rgm4)

The `mcp-atlassian` tool has a path traversal vulnerability (CWE-22, a weakness that lets attackers access files outside intended directories) in its `confluence_upload_attachment` function. An attacker can read any file the server can access by passing an arbitrary file path, then upload that file to an attacker-controlled server. This is especially dangerous because the default setup exposes the tool over the network without authentication, making it remotely exploitable.