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CVE-2026-77246

Estado: AnalizadaAlta (8.6)—

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, an HTTP transport deployment with READ_ONLY_MODE=false accepts a request without an Authorization identity and permits attacker-controlled Atlassian service headers, including X-Atlassian-Confluence-Url, to select a public attacker hostname or one allowed by MCP_ALLOWED_URL_DOMAINS. A caller can then invoke confluence_upload_attachment or the Jira attachment variant in src/mcp_atlassian/jira/attachments.py with a server-local file_path and cause the MCP process to send the file to the selected attachment endpoint. This issue is fixed in version 0.22.0.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N sin autenticación (PR:N, UI:N) en servidor web expuesto permite obtener archivos locales mediante manipulación de headers HTTP y funciones de carga de archivos sin validación.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Network SegmentationLimit Access to Resource Over NetworkFilter Network TrafficVulnerability ScanningUser TrainingPrivileged Account Management

Tecnologías afectadas (1)

Mcp-atlassian — MCP Atlassian

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-77246",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
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            },
            {
              "automatable": "no"
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            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-24T15:26:25.494462Z"
        }
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          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
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          "value": "CWE-22"
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        {
          "lang": "en",
          "value": "CWE-200"
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        {
          "lang": "en",
          "value": "CWE-441"
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      "lang": "en",
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    }
  ],
  "lastModified": "2026-09-28T14:31:10.220",
  "configurations": [
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        {
          "negate": false,
          "cpeMatch": [
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