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CVE-2026-77272

MCP Atlassian: Reflected XSS in OAuth Setup Callback Handler

CVSS 3.1 5.4 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-77272

Published

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.

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23 Oct 2026 15:48:27 UTC

MCP Atlassian: Reflected XSS in OAuth Setup Callback Handler

cve-program · CVE-2026-77272 · Published

ChangeIntel

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