The vulnerability of the upload_attachment function in the MPC-server for Atlassian’s Model Context Protocol (MCP) products allows a perpetrator to disclose protected information.

The vulnerability of the uploadattachment function in MPC-servers for Atlassian Model Context Protocol MCP products is related to an incorrect limitation on the path name to the catalog. Exploiting this vulnerability could allow a malicious actor to disclose protected information...

CVE-2026-27825

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to version 0.17.0, the confluencedownloadattachment MCP tool accepts a downloadpath parameter that is written to without any directory boundary enforcement. An attacker who can call this tool an...

CVE-2026-27826

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to version 0.17.0, an unauthenticated attacker who can reach the mcp-atlassian HTTP endpoint can force the server process to make outbound HTTP requests to an arbitrary attacker-controlled URL b...