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

Summaryinfo

A vulnerability has been found in sooperset mcp-atlassian up to 0.21.x and classified as problematic. Affected by this issue is the function upload_attachment of the file src/mcp_atlassian/confluence/attachments.py of the component Attachments. This manipulation of the argument file_path causes path traversal. This vulnerability is tracked as CVE-2026-77258. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in sooperset mcp-atlassian up to 0.21.x. It has been declared as problematic. Affected by this vulnerability is the function upload_attachment 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. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality. The summary by CVE is:

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, upload_attachment in src/mcp_atlassian/confluence/attachments.py accepts a caller-controlled file_path and opens the selected server-local file without restricting it to the workspace. A permitted Confluence MCP caller can upload the file as an attachment and disclose data readable by the server process. This issue is fixed in version 0.22.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-77258 since 08/20/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

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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