FKIE_CVE-2026-27825

Vulnerability from fkie_nvd - Published: 2026-03-10 20:16 - Updated: 2026-04-02 13:52
Severity ?
9.0 (Critical) - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.0 (High) - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to version 0.17.0, the `confluence_download_attachment` MCP tool accepts a `download_path` parameter that is written to without any directory boundary enforcement. An attacker who can call this tool and supply or access a Confluence attachment with malicious content can write arbitrary content to any path the server process has write access to. Because the attacker controls both the write destination and the written content (via an uploaded Confluence attachment), this constitutes for arbitrary code execution (for example, writing a valid cron entry to `/etc/cron.d/` achieves code execution within one scheduler cycle with no server restart required). Version 0.17.0 fixes the issue.
References
security-advisories@github.comhttps://github.com/sooperset/mcp-atlassian/commit/52b9b0997681e87244b20d58034deae89c91631ePatch
security-advisories@github.comhttps://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-xjgw-4wvw-rgm4Vendor Advisory
Impacted products
Vendor Product Version
mcp-atlassian mcp_atlassian *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "972ADC29-1D0B-47D0-8889-A1388AB7F9E7",
              "versionEndExcluding": "0.17.0",
              "vulnerable": true
            }
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          "negate": false,
          "operator": "OR"
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  "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, the `confluence_download_attachment` MCP tool accepts a `download_path` parameter that is written to without any directory boundary enforcement. An attacker who can call this tool and supply or access a Confluence attachment with malicious content can write arbitrary content to any path the server process has write access to. Because the attacker controls both the write destination and the written content (via an uploaded Confluence attachment), this constitutes for arbitrary code execution (for example, writing a valid cron entry to `/etc/cron.d/` achieves code execution within one scheduler cycle with no server restart required). 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, la herramienta MCP \u0027confluence_download_attachment\u0027 acepta un par\u00e1metro \u0027download_path\u0027 al que se escribe sin ninguna aplicaci\u00f3n de l\u00edmites de directorio. Un atacante que puede llamar a esta herramienta y proporcionar o acceder a un archivo adjunto de Confluence con contenido malicioso puede escribir contenido arbitrario a cualquier ruta a la que el proceso del servidor tenga acceso de escritura. Debido a que el atacante controla tanto el destino de escritura como el contenido escrito (a trav\u00e9s de un archivo adjunto de Confluence subido), esto constituye una ejecuci\u00f3n de c\u00f3digo arbitrario (por ejemplo, escribir una entrada cron v\u00e1lida en \u0027/etc/cron.d/\u0027 logra la ejecuci\u00f3n de c\u00f3digo dentro de un ciclo del planificador sin necesidad de reiniciar el servidor). La versi\u00f3n 0.17.0 corrige el problema."
    }
  ],
  "id": "CVE-2026-27825",
  "lastModified": "2026-04-02T13:52:39.883",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.0,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 2.3,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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      {
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          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
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  "published": "2026-03-10T20:16:37.417",
  "references": [
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      "tags": [
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-73"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.