MCP Atlassian: Arbitrary File Read & Exfiltration (Confused Deputy) in JIRA update_issue

Summary A critical Confused Deputy Arbitrary File Read & Exfiltration vulnerability in the Atlassian MCP server Python allows an AI agent to exfiltrate sensitive host files and environment secrets. By providing absolute system paths to the attachments parameter of the updateissue tool, an agent c...

CVE-2026-77255

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the Jira updateissue attachments argument is converted into local paths and routed to the attachment upload implementation without workspace validation. A caller can make the MCP serv...

CVE-2026-77247

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, Jira and Confluence upload tools interpret caller-controlled path arguments on the MCP server and open those files before sending them as attachments. In remote or multi-user...

CVE-2026-77255 MCP Atlassian: Arbitrary File Read & Exfiltration (Confused Deputy) in JIRA update_issue

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the Jira updateissue attachments argument is converted into local paths and routed to the attachment upload implementation without workspace validation. A caller can make the MCP serv...

CVE-2026-77255

The mcp-atlassian Model Context Protocol server (versions prior to 0.22.0 ) is vulnerable to an arbitrary file read and exfiltration via a confused deputy attack. The flaw exists in the update_issue function, where the attachments argument is converted into local paths and passed to the upload_at...