CVE-2026-77272: Mcp-Atlassian Mcp Atlassian

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the OAuth error query parameter is passed to CallbackHandler._send_response in oauth_setup.py and interpolated into an HTML page without escaping. A crafted authorization callback can inject markup or script that executes in the browser of a user completing the OAuth flow. This issue is fixed in version 0.22.0.

Affected products

• Mcp-Atlassian Mcp Atlassian: before 0.22.0 (fixed in 0.22.0)

Published 2026-09-22. Last modified 2026-09-28.