CVE-2026-77257

Medium

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, HTTP-exposed Jira and Confluence upload tools pass a caller-provided file_path to local file operations without restricting it to the workspace. A remote MCP caller with tool access can cause the server to read sensitive local files and upload them as Atlassian attachments. The advisory traces the vulnerable input and processing flow through streamable-http, upload_attachment, and file_path, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

SeverityMedium

CVSS6.5

Exploit probability—

ProductMcp-atlassian Mcp Atlassian

PublishedSep 22, 2026

First seenSep 22, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

mcp-atlassian mcp_atlassian0.22.0 or later
mcp-atlassian0.22.0 or later

Affected products

Product	Affected versions	Fixed in
mcp-atlassian mcp_atlassian	v < 0.22.0	0.22.0
mcp-atlassianPyPI	v < 0.22.0	0.22.0

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