CVE-2026-77262 | BDVDB-2026-377776 Detail

Description#

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, confluence_upload_attachment accepts an attacker-controlled file_path and does not apply the path restriction added for the earlier download vulnerability. A caller can traverse outside the workspace and upload arbitrary server-readable files to Confluence. The advisory traces the vulnerable input and processing flow through confluence_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.

Impact#

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Exploit#

History#

1. Version 12026-09-22Record published in the CVE List.
2. Version 22026-09-28Most recent update recorded in the CVE List.