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CVE-2026-27825— MCP Atlassian has an arbitrary file write leading to arbitrary code execution via unconstrained download_path in confluence_download_attachment

Quick assessment

Affected
sooperset mcp-atlassian
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP Atlassian是Hyeonsoo Lee个人开发者的一个连接AI助手与项目管理工具的MCP服务器。 MCP Atlassian 0.17.0之前版本存在安全漏洞，该漏洞源于confluence_download_attachment工具未对download_path参数进行目录边界强制，可能导致任意代码执行。

CVSS 9.1 · Critical EPSS 1.53% · P74
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I. Basic Information for CVE-2026-27825

Vulnerability Information
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Vulnerability Title
MCP Atlassian has an arbitrary file write leading to arbitrary code execution via unconstrained download_path in confluence_download_attachment
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
MCP Atlassian 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP Atlassian是Hyeonsoo Lee个人开发者的一个连接AI助手与项目管理工具的MCP服务器。 MCP Atlassian 0.17.0之前版本存在安全漏洞，该漏洞源于confluence_download_attachment工具未对download_path参数进行目录边界强制，可能导致任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
sooperset mcp-atlassian < 0.17.0 -

II. Public POCs for CVE-2026-27825

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7174 chars
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III. Intelligence Information for CVE-2026-27825

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Patches & Fixes for CVE-2026-27825 (1)

Vendor Advisories for CVE-2026-27825 (1)

IV. Related Vulnerabilities

Same product: mcp-atlassian
Same vendor: sooperset
Same weakness: CWE-22

V. Comments for CVE-2026-27825

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