CVE-2026-77261: Mcp-Atlassian Mcp Atlassian

High severity, CVSS 8.5. EPSS: 0.3% 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, _make_ssrf_safe_hook is omitted from JiraFetcher and ConfluenceFetcher sessions created through the basic-auth and oauth_pat branches. If an attacker-controlled or compromised configured Atlassian instance returns a redirect to an internal address, those sessions can follow the redirect without revalidating its destination. 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 2026-09-25.