GHSA-WV8V-V4C5-V75J MCP Atlassian: MCP HTTP Client Server-Local File Exfiltration via Unvalidated Attachment Upload Path

Summary The mcp-atlassian server exposes an MCP tool confluenceuploadattachment and the Jira attachment variant that accepts an arbitrary server-side file path and opens it for upload without any path validation. When the server is deployed in HTTP transport mode streamable-http or sse, a remote,...

CVE-2026-77246 MCP Atlassian: MCP HTTP Client Server-Local File Exfiltration via Unvalidated Attachment Upload Path

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, an HTTP transport deployment with READONLYMODE=false accepts a request without an Authorization identity and permits attacker-controlled Atlassian service headers, including...

CVE-2026-77246

MCP Atlassian , a Model Context Protocol server for Confluence and Jira, is vulnerable to server-local file exfiltration in versions prior to 0.22.0 . In an HTTP transport deployment where READ_ONLY_MODE=false , the server accepts requests without an Authorization identity and allows attacker-con...