MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, upload_attachment accepts absolute paths and traversal sequences without constraining the resolved path to the server workspace. An MCP caller with attachment access can read a chosen server-local file and exfiltrate it through Jira or Confluence. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and path traversal, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
Metrics
Affected Vendors & Products
References
History
Mon, 28 Sep 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
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Mcp-atlassian
Mcp-atlassian mcp Atlassian |
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| CPEs | cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mcp-atlassian
Mcp-atlassian mcp Atlassian |
Tue, 22 Sep 2026 20:30:00 +0000
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ssvc
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Tue, 22 Sep 2026 19:45:00 +0000
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Sooperset
Sooperset mcp-atlassian |
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| Vendors & Products |
Sooperset
Sooperset mcp-atlassian |
Tue, 22 Sep 2026 18:45:00 +0000
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| Description | MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, upload_attachment accepts absolute paths and traversal sequences without constraining the resolved path to the server workspace. An MCP caller with attachment access can read a chosen server-local file and exfiltrate it through Jira or Confluence. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and path traversal, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0. | |
| Title | MCP Atlassian: Path traversal in upload_attachment allows arbitrary file read and exfiltration via MCP tool call | |
| Weaknesses | CWE-22 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-09-22T18:30:58.517Z
Updated: 2026-09-22T19:06:52.718Z
Reserved: 2026-08-20T19:14:21.330Z
Link: CVE-2026-77266
Updated: 2026-09-22T19:06:24.176Z
Status : Analyzed
Published: 2026-09-22T19:16:50.627
Modified: 2026-09-28T13:14:12.170
Link: CVE-2026-77266
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