Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-77254

Gravedad CVSS v3.1:
CRÍTICA
Tipo:
CWE-306 Ausencia de autenticación para una función crítica
Fecha de publicación:
22/09/2026
Última modificación:
28/09/2026

Descripción

*** Pendiente de traducción *** MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, requests to the HTTP MCP endpoint without a per-user identity are allowed to reach tool handlers, which then use globally configured Jira or Confluence credentials. A network caller can perform operations with the operator account's permissions unless the deployment has an independent authentication boundary. The advisory traces the vulnerable input and processing flow through streamable-http, UserTokenMiddleware, _get_fetcher, and global credentials, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Productos y versiones vulnerables

CPE Desde Hasta
cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:* 0.22.0 (excluyendo)