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 deployments, a permitted client can disclose host files without shell or direct filesystem access. The advisory traces the vulnerable input and processing flow through AttachmentsMixin.upload_attachment, AttachmentsMixin.upload_attachments, file_path, file_paths, and jira update_issue, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

• CWE-73

• https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460Patch
• https://github.com/sooperset/mcp-atlassian/pull/1448Issue Tracking, Patch
• https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0Release Notes
• https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f6pj-qv47-g96wExploit, Vendor Advisory
• https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f6pj-qv47-g96wExploit, Vendor Advisory

Published

Sep 22, 2026

Last Modified

Sep 28, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-7724A vulnerability has been found in PrefectHQ prefect up to 3.…5
• CVE-2026-77240WACRM is a self-hostable CRM template for WhatsApp. In versi…9.9
• CVE-2026-77242MCP Atlassian is a Model Context Protocol (MCP) server for A…7.5
• CVE-2026-77243MCP Atlassian is a Model Context Protocol (MCP) server for A…8.8
• CVE-2026-77244MCP Atlassian is a Model Context Protocol (MCP) server for A…10
• CVE-2026-77246MCP Atlassian is a Model Context Protocol (MCP) server for A…8.6
• CVE-2026-77248MCP Atlassian is a Model Context Protocol (MCP) server for A…8.6
• CVE-2026-77249MCP Atlassian is a Model Context Protocol (MCP) server for A…5.3
• CVE-2026-7725A vulnerability was found in PrefectHQ prefect up to 3.6.25.…6.3
• CVE-2026-77250MCP Atlassian is a Model Context Protocol (MCP) server for A…6.1
• CVE-2026-77251MCP Atlassian is a Model Context Protocol (MCP) server for A…6.5
• CVE-2026-77252MCP Atlassian is a Model Context Protocol (MCP) server for A…6.5