CVE-2026-77262
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, confluence_upload_attachment accepts an attacker-controlled file_path and does not apply the path restriction added for the earlier download vulnerability. A caller can traverse outside the workspace and upload arbitrary server-readable files to Confluence. The advisory traces the vulnerable input and processing flow through confluence_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
2026-09-22
AI Q&A
2026-09-22
EPSS Evaluated
N/A
NVD
CVE-2026-77262
EUVD
EUVD-2026-84744

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
atlassian mcp_atlassian 0.22.0
atlassian mcp_atlassian to 0.22.0 (exc)
atlassian confluence to 0.22.0 (exc)
atlassian jira to 0.22.0 (exc)

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-2026-77262 is a Path Traversal vulnerability in the MCP Atlassian server for Confluence. It allows attackers to read arbitrary files on the server by exploiting the confluence_upload_attachment tool. The file_path argument is passed directly to open() without validation, enabling access to sensitive files like /etc/passwd or configuration files.

Detection Guidance

Check if the mcp-atlassian package version is below 0.22.0 using pip show mcp-atlassian. Inspect network traffic for MCP tool invocations with file_path parameters. Monitor Confluence server logs for unusual attachment uploads or file access patterns.

Impact Analysis

An attacker could read sensitive files on the server, including system files, credentials, SSH keys, or application source code. This could lead to data breaches, privilege escalation, or further attacks. The exploit is remotely accessible without authentication due to default insecure settings.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles or HIPAA's security requirements. Organizations using this software may face compliance violations, legal penalties, and reputational damage due to potential data exposure.

Mitigation Strategies

Upgrade mcp-atlassian to version 0.22.0 or later immediately. Restrict the default streamable-http transport binding to 127.0.0.1 or enforce authentication. Add input validation for file_path to reject absolute paths and parent directory traversals.

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