CVE-2026-27825

CRITICAL

9.0

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.

CVE Details

CVSS v3.1 Score9.0

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack VectorADJACENT_NETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published3/10/2026

Last Modified4/2/2026

Sourcenvd

Honeypot Sightings0

Affected Products

mcp-atlassian:mcp_atlassian

Weaknesses (CWE)

CWE-22CWE-73

References

https://github.com/sooperset/mcp-atlassian/commit/52b9b0997681e87244b20d58034deae89c91631e(security-advisories@github.com)

https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-xjgw-4wvw-rgm4(security-advisories@github.com)

IOC Correlations

No correlations recorded

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