{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:sooperset:mcp_atlassian:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "33DDEA27-F2D6-4CF3-9EB4-C03CC01B631A",
              "versionEndExcluding": "0.17.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "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 \u2014 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 versi\u00f3n 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 \u0027Authorization\u0027. No se requiere autenticaci\u00f3n. La vulnerabilidad existe en el middleware HTTP y la capa de inyecci\u00f3n de dependencias \u2014 no en ning\u00fan gestor de herramientas MCP - haci\u00e9ndola invisible para el an\u00e1lisis de c\u00f3digo a nivel de herramienta. En despliegues en la nube, esto podr\u00eda permitir el robo de credenciales de rol de IAM a trav\u00e9s del endpoint de metadatos de instancia (\u0027169[.]254[.]169[.]254\u0027). En cualquier despliegue HTTP permite el reconocimiento de red interno y la inyecci\u00f3n de contenido controlado por el atacante en los resultados de las herramientas LLM. La versi\u00f3n 0.17.0 soluciona el problema."
    }
  ],
  "id": "CVE-2026-27826",
  "lastModified": "2026-04-13T15:01:48.520",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-10T19:17:20.670",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/sooperset/mcp-atlassian/commit/5cd697dfce9116ef330b8dc7a91291640e0528d9"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory",
        "Exploit"
      ],
      "url": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-7r34-79r5-rcc9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}