CVE WatchSep 28, 2026

CVE-2026-77274

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf

CVSS

8.2

High

EPSS

0.3%

p24

KEV

—

Exploit Today

0-100

Published: Sep 22, 2026 · Last modified: Sep 28, 2026 · CWE-918

EPSS · 30d

0.3%EPSS · 30 days0.7%

2026-09-232026-10-20

Technical 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 has a backslash authority confusion because it interprets the authority differently from the Requests connection layer in the header-based Jira and Confluence URL authentication flow. A crafted URL can validate as an external hostname while the HTTP client connects to an internal host, permitting server-side requests to protected network resources. This issue is fixed in version 0.22.0.

Official references

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