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    CVE-2026-27825

    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.

    Published:Mar 10, 2026
    Last Modified:Apr 17, 2026
    EPS:Mar 10, 2026
    EPSS Score:0.00047
    CVSS Score:9.1

    Affected Products

    Vendor
    Mcp-atlassian
    Product
    Mcp Atlassian
    Vendor
    Sooperset
    Product
    Mcp-atlassian

    Exploits

    https://github.com/plutosecurity/MCPwnfluencehttps://github.com/romain-deperne/CVE-2026-27825

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High