MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, an HTTP transport deployment with READ_ONLY_MODE=false accepts a request without an Authorization identity and permits attacker-controlled Atlassian service headers, including X-Atlassian-Confluence-Url, to select a public attacker hostname or one allowed by MCP_ALLOWED_URL_DOMAINS. A caller can then invoke confluence_upload_attachment or the Jira attachment variant in src/mcp_atlassian/jira/attachments.py with a server-local file_path and cause the MCP process to send the file to the selected attachment endpoint. This issue is fixed in version 0.22.0.
Metrics
Affected Vendors & Products
References
History
Mon, 28 Sep 2026 14:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
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 |
Fri, 25 Sep 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Tue, 22 Sep 2026 21:30:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Sooperset
Sooperset mcp-atlassian |
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| Vendors & Products |
Sooperset
Sooperset mcp-atlassian |
Tue, 22 Sep 2026 19:00:00 +0000
| Type | Values Removed | Values Added |
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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, an HTTP transport deployment with READ_ONLY_MODE=false accepts a request without an Authorization identity and permits attacker-controlled Atlassian service headers, including X-Atlassian-Confluence-Url, to select a public attacker hostname or one allowed by MCP_ALLOWED_URL_DOMAINS. A caller can then invoke confluence_upload_attachment or the Jira attachment variant in src/mcp_atlassian/jira/attachments.py with a server-local file_path and cause the MCP process to send the file to the selected attachment endpoint. This issue is fixed in version 0.22.0. | |
| Title | MCP Atlassian: MCP HTTP Client Server-Local File Exfiltration via Unvalidated Attachment Upload Path | |
| Weaknesses | CWE-200 CWE-22 CWE-441 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-09-22T18:51:54.540Z
Updated: 2026-09-24T15:26:33.550Z
Reserved: 2026-08-20T19:02:23.416Z
Link: CVE-2026-77246
Updated: 2026-09-24T15:26:08.279Z
Status : Analyzed
Published: 2026-09-22T19:16:48.730
Modified: 2026-09-28T14:31:10.220
Link: CVE-2026-77246
No data.