CVE-2026-27825
8.0
Vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 2.1 / Impact: 5.9
Source: NVD
Description
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.
Affected (1)
Products: Mcp Atlassian: Mcp Atlassian
Configuration A
| Vulnerable Software | Affected Versions |
|---|---|
| Before 0.17.0 |
Related CWEs
CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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.
CWE-73
External Control of File Name or Path
The product allows user input to control or influence paths or file names that are used in filesystem operations.
References (2)
Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Vendor Advisory
Timeline
No history available yet.