CVE-2026-77272
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.
- Published Sep 22, 2026
- CVSS 6.1 medium
- 0.2% chance of exploitation in the next 30 days (EPSS)
- Public exploit code is available
- A fix is available