CVE-2026-77260
MCP Atlassian: Arbitrary local file READ via unconstrained file_path in upload_attachment (Confluence + Jira)
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Confluence and Jira upload_attachment implementations accept an unconstrained file_path and open the referenced server-local file. A permitted MCP caller can upload sensitive host files to an Atlassian destination and then retrieve their contents. 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.
| CWE | CWE-22 |
| Vendor | sooperset |
| Product | mcp-atlassian |
| Published | Sep 22, 2026 |
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Affected Versions
sooperset / mcp-atlassian
< 0.22.0
References
github.com: https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f4p7-qx46-wc5j github.com: https://github.com/sooperset/mcp-atlassian/pull/1448 github.com: https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 github.com: https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0