{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-03T22:57:10.301","vulnerabilities":[{"cve":{"id":"CVE-2026-27826","sourceIdentifier":"security-advisories@github.com","published":"2026-03-10T19:17:20.670","lastModified":"2026-04-13T15:01:48.520","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to version 0.17.0, an unauthenticated attacker who can reach the mcp-atlassian HTTP endpoint can force the server process to make outbound HTTP requests to an arbitrary attacker-controlled URL by supplying two custom HTTP headers without an `Authorization` header. No authentication is required. The vulnerability exists in the HTTP middleware and dependency injection layer — not in any MCP tool handler - making it invisible to tool-level code analysis. In cloud deployments, this could enable theft of IAM role credentials via the instance metadata endpoint (`169[.]254[.]169[.]254`). In any HTTP deployment it enables internal network reconnaissance and injection of attacker-controlled content into LLM tool results. Version 0.17.0 fixes the issue."},{"lang":"es","value":"MCP Atlassian es un servidor de Model Context Protocol (MCP) para productos de Atlassian (Confluence y Jira). Antes de la versión 0.17.0, un atacante no autenticado que puede alcanzar el endpoint HTTP mcp-atlassian puede forzar al proceso del servidor a realizar solicitudes HTTP salientes a una URL arbitraria controlada por el atacante al proporcionar dos encabezados HTTP personalizados sin un encabezado 'Authorization'. No se requiere autenticación. La vulnerabilidad existe en el middleware HTTP y la capa de inyección de dependencias — no en ningún gestor de herramientas MCP - haciéndola invisible para el análisis de código a nivel de herramienta. En despliegues en la nube, esto podría permitir el robo de credenciales de rol de IAM a través del endpoint de metadatos de instancia ('169[.]254[.]169[.]254'). En cualquier despliegue HTTP permite el reconocimiento de red interno y la inyección de contenido controlado por el atacante en los resultados de las herramientas LLM. La versión 0.17.0 soluciona el problema."}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","baseScore":8.2,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":4.7},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","baseScore":8.2,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":4.7}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-918"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:sooperset:mcp_atlassian:*:*:*:*:*:*:*:*","versionEndExcluding":"0.17.0","matchCriteriaId":"33DDEA27-F2D6-4CF3-9EB4-C03CC01B631A"}]}]}],"references":[{"url":"https://github.com/sooperset/mcp-atlassian/commit/5cd697dfce9116ef330b8dc7a91291640e0528d9","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-7r34-79r5-rcc9","source":"security-advisories@github.com","tags":["Vendor Advisory","Exploit"]}]}}]}