sooperset mcp-atlassian up to 0.21.x Attachments attachments.py _upload_attachment_direct file_path path traversal

Summaryinfo

A vulnerability labeled as problematic has been found in sooperset mcp-atlassian up to 0.21.x. This issue affects the function _upload_attachment_direct of the file src/mcp_atlassian/confluence/attachments.py of the component Attachments. Such manipulation of the argument file_path leads to path traversal. This vulnerability is traded as CVE-2026-73498. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in sooperset mcp-atlassian up to 0.21.x. It has been rated as problematic. Affected by this issue is the function _upload_attachment_direct of the file src/mcp_atlassian/confluence/attachments.py of the component Attachments. The manipulation of the argument file_path with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. CVE summarizes:

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, confluence_upload_attachment passes its client-supplied file_path directly to open(file_path, "rb") in src/mcp_atlassian/confluence/attachments.py through _upload_attachment_direct() without calling validate_safe_path. An authenticated MCP client can read any file accessible to the server process and exfiltrate it to Confluence as an attachment. If an AI agent can be induced to call the tool through untrusted content, the same flaw can disclose server environment variables such as CONFLUENCE_API_TOKEN and other credentials. This issue is fixed in version 0.22.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-73498 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 0.22.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• sooperset

Name

• mcp-atlassian

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21

Website

• Product: https://github.com/sooperset/mcp-atlassian/

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CPE 2.2info

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