CVE-2026-77259

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, confluence_upload_attachment opens a caller-selected server-local file without checking that the resolved path remains in the workspace. A caller can upload environment files, credentials, or other readable host data to a Confluence page and retrieve it through Atlassian. The advisory traces the vulnerable input and processing flow through confluence_upload_attachment, file_path, and open(file_path, "rb"), which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

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Produits concernés

• sooperset mcp-atlassian
• Mcp-atlassian mcp atlassian

Scores CVSS

Faiblesses (CWE)

• CWE-22
• CWE-552

Références

• https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 Patch
• https://github.com/sooperset/mcp-atlassian/pull/1448 Issue TrackingPatch
• https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 Release Notes
• https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6cr4-ccf3-x7h4 ExploitMitigationVendor Advisory
• https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6cr4-ccf3-x7h4 ExploitMitigationVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories