sooperset mcp-atlassian up to 0.16.x Model Context Protocol /etc/cron.d/ confluence_download_attachment download_path path traversal

Summaryinfo

A vulnerability was found in sooperset mcp-atlassian up to 0.16.x and classified as critical. The affected element is the function confluence_download_attachment of the file /etc/cron.d/ of the component Model Context Protocol. Executing a manipulation of the argument download_path can lead to path traversal. This vulnerability appears as CVE-2026-27825. The attacker needs to be present on the local network. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in sooperset mcp-atlassian up to 0.16.x and classified as critical. This vulnerability affects the function confluence_download_attachment of the file /etc/cron.d/ of the component Model Context Protocol. The manipulation of the argument download_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, integrity, and availability. CVE summarizes:

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to version 0.17.0, the `confluence_download_attachment` MCP tool accepts a `download_path` parameter that is written to without any directory boundary enforcement. An attacker who can call this tool and supply or access a Confluence attachment with malicious content can write arbitrary content to any path the server process has write access to. Because the attacker controls both the write destination and the written content (via an uploaded Confluence attachment), this constitutes for arbitrary code execution (for example, writing a valid cron entry to `/etc/cron.d/` achieves code execution within one scheduler cycle with no server restart required). Version 0.17.0 fixes the issue.

The advisory is available at github.com. This vulnerability was named CVE-2026-27825 since 02/24/2026. The exploitation appears to be easy. The attack needs to be initiated within the local network. 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 0.17.0 eliminates this vulnerability. Applying the patch 52b9b0997681e87244b20d58034deae89c91631e is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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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

License

• open-source

Website

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

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