Vulnerability Details CVE-2026-77269
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the remediation for CVE-2026-27825 protects download destinations but does not constrain source paths used by attachment uploads. A caller can provide an absolute or traversal file_path and cause the server to upload the selected local file. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and CVE-2026-27825, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 29.0%
CVSS Severity
CVSS v3 Score 6.5
References
- https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460
- https://github.com/sooperset/mcp-atlassian/pull/1448
- https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-h7wj-5v37-59r2
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-h7wj-5v37-59r2
Products affected by CVE-2026-77269
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cpe:2.3:a:mcp-atlassian:mcp_atlassian:*