CyberRota Analysis
AI-GeneratedThe vulnerability affects the MCP server for Atlassian products, specifically Confluence and Jira, allowing attackers to exploit a flaw in the validate_url_for_ssrf function, which fails to properly validate DNS resolutions during connection attempts. This can lead to unauthorized access to internal or metadata endpoints, even after previous mitigations were implemented. Organizations using versions prior to 0.22.0 should prioritize updating to the latest version to mitigate this high-severity risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf checks a hostname's resolved addresses, but Requests and urllib3 resolve the hostname again when connecting. A caller can use a short-lived DNS answer that is public during validation and private during connection, preserving unauthenticated access to internal or metadata endpoints despite the earlier CVE-2026-27826 remediation. The advisory traces the vulnerable input and processing flow through validate_url_for_ssrf, _check_dns_resolution, socket.getaddrinfo, and _make_ssrf_safe_hook, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
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