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CVE-2026-77259

MCP Atlassian: Arbitrary file read via confluence_upload_attachment allows exfiltration of server credentials PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
sooperset / mcp-atlassianaffected < 0.22.0

CWE

CWE-22, CWE-552

References

ADP enrichment

CISA-ADP

No English description supplied.