Is CVE-2026-27825 actively exploited?

No active exploitation of CVE-2026-27825 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27825 be exploited remotely?

Partially. CVE-2026-27825 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-27825?

CVE-2026-27825 has a CVSS score of 9.0 (CRITICAL).

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CRITICAL

CVE-2026-27825

CWE-22Published: March 10, 2026· Updated: Mar 11, 2026

9.0

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:6.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-27825 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.