CVE-2026-77258
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, upload_attachment in src/mcp_atlassian/confluence/attachments.py accepts a caller-controlled file_path and opens the selected server-local file without restricting it to the workspace. A permitted Confluence MCP caller can upload the file as an attachment and disclose data readable by the server process. This issue is fixed in version 0.22.0.
- Published Sep 22, 2026
- CVSS 7.7 high
- 0.3% chance of exploitation in the next 30 days (EPSS)
- Public exploit code is available
- A fix is available