mcp-atlassian has an incomplete SSRF remediation

Summary The UserTokenMiddleware extracts URLs from X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url HTTP headers and passes them directly to API client constructors without any SSRF validation. Affected Package - Ecosystem: PyPI - Package: mcp-atlassian - Affected versions: all versions before...

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 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...

EUVD-2026-84771

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-2026-77265

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a...

CVE-2026-77267

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers are processed by processauthenticationheaders and used to construct Atlassian fetchers without calling...

EUVD-2026-84621

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers are processed by processauthenticationheaders and used to construct Atlassian fetchers without calling...

CVE-2026-77267

The MCP Atlassian server (a Model Context Protocol server for Confluence and Jira) is vulnerable to Server-Side Request Forgery (SSRF) in versions prior to 0.22.0 . The root cause is that the _process_authentication_headers function processes X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url he...

CVE-2026-77265

The MCP Atlassian Model Context Protocol server is vulnerable to Server-Side Request Forgery (SSRF) via DNS rebinding in versions prior to 0.22.0 . An unauthenticated caller can provide a hostname through the X-Atlassian-Jira-Url or X-Atlassian-Confluence-Url headers. Because the software validat...

EUVD-2026-84606

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a...