CVE WatchSep 28, 2026

CVE-2026-77270

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Jira and Confluenc

CVSS

6.5

Medium

EPSS

0.4%

p30

KEV

—

Exploit Today

0-100

Published: Sep 22, 2026 · Last modified: Sep 28, 2026 · CWE-22

EPSS · 30d

0.4%EPSS · 30 days0.5%

2026-09-232026-10-20

Technical description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Jira and Confluence attachment upload tools treat caller-controlled file_path values as trusted server-local paths. The server opens the selected file and uploads it to an Atlassian issue or page, allowing an MCP caller with upload access to disclose any file readable by the server process. The advisory traces the vulnerable input and processing flow through confluence_upload_attachment, jira_upload_attachment, file_path, and open(file_path, "rb"), which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Official references

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