CVE-2026-77269
Received Received - Intake

Path Traversal in MCP Atlassian Server

Publication date: 2026-09-22

Last updated on: 2026-09-22

Assigner: GitHub, Inc.

Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the remediation for CVE-2026-27825 protects download destinations but does not constrain source paths used by attachment uploads. A caller can provide an absolute or traversal file_path and cause the server to upload the selected local file. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and CVE-2026-27825, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

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Meta Information

Published
2026-09-22
Last Modified
2026-09-22
Generated
2026-09-23
AI Q&A
2026-09-22
EPSS Evaluated
N/A
NVD
CVE-2026-77269
EUVD
EUVD-2026-84748

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
sooperset mcp-atlassian 0.22.0
sooperset mcp-atlassian to 0.22.0 (exc)
atlassian mcp 0.22.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

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Executive Summary

CVE-2026-77269 is a path traversal vulnerability in the mcp-atlassian package's upload_attachment function. It allows arbitrary file reads on the server by exploiting unvalidated file_path parameters in Confluence and Jira upload functions. The issue stems from an incomplete fix for CVE-2026-27825, which only secured download operations but not uploads.

Detection Guidance

Check if the mcp-atlassian package version is below 0.22.0 using package managers like pip. Inspect server logs for unusual file uploads or path traversal attempts in attachment upload functions. Look for files uploaded with absolute or traversal paths in Confluence or Jira.

Impact Analysis

An attacker could exploit this to read sensitive files on the server, such as SSH keys, .env files, or API credentials, by uploading them to Confluence or Jira. This could lead to unauthorized access, data breaches, or further compromise of the system.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles or HIPAA's security requirements for protected health information. Organizations may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Upgrade the mcp-atlassian package to version 0.22.0 or later. Apply input validation to restrict file_path parameters in upload_attachment functions. Review and remove any suspicious files uploaded via the affected functions. Monitor for unauthorized file access attempts.

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