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CVE-2026-27825

Mcp-atlassian Mcp Atlassian path traversal

9.0 CRITICALEPSS 1.53%
  1. Published10 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorAdjacent
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Mcp-atlassian Mcp Atlassian< 0.17.0

Remediation

Fixed in
Mcp-atlassian Mcp Atlassian≥ 0.17.0

References

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Frequently asked

Is CVE-2026-27825 being actively exploited?

CVE-2026-27825 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.53%.

How severe is CVE-2026-27825?

CVE-2026-27825 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 1.53% probability of exploitation.

Which products are affected by CVE-2026-27825?

Affected products include Mcp-atlassian Mcp Atlassian.

How do I fix CVE-2026-27825?

Upgrade affected software to a fixed version, for example Mcp-atlassian Mcp Atlassian 0.17.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.