CVE-2026-77248: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in sooperset mcp-atlassian
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the streamable HTTP transport accepts requests without a user identity and falls back to operator credentials, while upload_attachment accepts an unrestricted file_path. An unauthenticated network caller can read files available to the MCP process, upload them to an attacker-selected Jira issue or Confluence page, and retrieve the contents. The advisory traces the vulnerable input and processing flow through streamable-http, UserTokenMiddleware, upload_attachment, file_path, and _get_fetcher, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
AI Analysis
Technical Summary
The vulnerability in sooperset mcp-atlassian (prior to 0.22.0) involves improper limitation of a pathname to a restricted directory (CWE-22). The streamable HTTP transport accepts requests without user identity and defaults to operator credentials, while the upload_attachment function accepts an unrestricted file_path parameter. An unauthenticated attacker can exploit this to read files accessible to the MCP process, upload them to attacker-selected Jira issues or Confluence pages, and retrieve their contents. The vulnerability affects the input and processing flow through streamable-http, UserTokenMiddleware, upload_attachment, file_path, and _get_fetcher. The issue is resolved in version 0.22.0.
Potential Impact
An unauthenticated remote attacker can read arbitrary files accessible to the MCP process and upload their contents to Jira or Confluence pages controlled by the attacker. This leads to a confidentiality breach of potentially sensitive information. There is no indication of impact on integrity or availability. The vulnerability allows remote network exploitation without authentication.
Mitigation Recommendations
Upgrade to sooperset mcp-atlassian version 0.22.0 or later, where this vulnerability is fixed. No other mitigation is indicated or required as the fix addresses the root cause.
CVE-2026-77248: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in sooperset mcp-atlassian
Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the streamable HTTP transport accepts requests without a user identity and falls back to operator credentials, while upload_attachment accepts an unrestricted file_path. An unauthenticated network caller can read files available to the MCP process, upload them to an attacker-selected Jira issue or Confluence page, and retrieve the contents. The advisory traces the vulnerable input and processing flow through streamable-http, UserTokenMiddleware, upload_attachment, file_path, and _get_fetcher, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
CVSS v3.1
Score 8.6high
Affected software
sooperset
mcp-atlassian
pkg:github/sooperset/mcp-atlassianRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in sooperset mcp-atlassian (prior to 0.22.0) involves improper limitation of a pathname to a restricted directory (CWE-22). The streamable HTTP transport accepts requests without user identity and defaults to operator credentials, while the upload_attachment function accepts an unrestricted file_path parameter. An unauthenticated attacker can exploit this to read files accessible to the MCP process, upload them to attacker-selected Jira issues or Confluence pages, and retrieve their contents. The vulnerability affects the input and processing flow through streamable-http, UserTokenMiddleware, upload_attachment, file_path, and _get_fetcher. The issue is resolved in version 0.22.0.
Potential Impact
An unauthenticated remote attacker can read arbitrary files accessible to the MCP process and upload their contents to Jira or Confluence pages controlled by the attacker. This leads to a confidentiality breach of potentially sensitive information. There is no indication of impact on integrity or availability. The vulnerability allows remote network exploitation without authentication.
Mitigation Recommendations
Upgrade to sooperset mcp-atlassian version 0.22.0 or later, where this vulnerability is fixed. No other mitigation is indicated or required as the fix addresses the root cause.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T19:02:23.416Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab2d108f7a7c541069ead02
Added to database: 09/22/2026, 19:03:36 UTC
Last enriched: 09/22/2026, 19:17:55 UTC
Last updated: 09/23/2026, 01:58:06 UTC
Views: 8
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