CVE Watch29 sept 2026

CVE-2026-77265

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

CVSS

5.9

Medio

EPSS

0.3%

p18

KEV

—

Exploit Today

0-100

Publicado: 22 sept 2026 · Última mod.: 29 sept 2026 · CWE-918

EPSS · 30d

0.3%EPSS · 30 días0.4%

2026-09-232026-10-20

Descripción técnica

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a DNS-rebinding hostname that returns a public address during validation and an internal address during connection, causing requests to internal or metadata services. The advisory traces the vulnerable input and processing flow through X-Atlassian-Jira-Url, X-Atlassian-Confluence-Url, validate_url_for_ssrf, and DNS rebinding, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Referencias oficiales

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