Common Weakness Enumeration

CWE-94

Allowed-with-Review

Improper Control of Generation of Code ('Code Injection')

Abstraction: Base · Status: Draft

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

8292 vulnerabilities reference this CWE, most recent first.

GHSA-WF6V-M5V4-PHR8

Vulnerability from github – Published: 2022-04-29 01:26 – Updated: 2022-04-29 01:26
VLAI
Details

Ultimate PHP Board (UPB) 1.9 allows remote attackers to execute arbitrary PHP code with UPB administrator privileges via an HTTP request containing the code in the User-Agent header, which is executed when the administrator executes admin_iplog.php.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2003-0395"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2003-07-02T04:00:00Z",
    "severity": "HIGH"
  },
  "details": "Ultimate PHP Board (UPB) 1.9 allows remote attackers to execute arbitrary PHP code with UPB administrator privileges via an HTTP request containing the code in the User-Agent header, which is executed when the administrator executes admin_iplog.php.",
  "id": "GHSA-wf6v-m5v4-phr8",
  "modified": "2022-04-29T01:26:21Z",
  "published": "2022-04-29T01:26:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2003-0395"
    },
    {
      "type": "WEB",
      "url": "http://f0kp.iplus.ru/bz/024.en.txt"
    },
    {
      "type": "WEB",
      "url": "http://marc.info/?l=bugtraq\u0026m=105379741528925\u0026w=2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-WF78-9XPM-M77R

Vulnerability from github – Published: 2022-05-24 16:54 – Updated: 2024-04-04 01:48
VLAI
Details

rpc.cgi in Webmin through 1.920 allows authenticated Remote Code Execution via a crafted object name because unserialise_variable makes an eval call. NOTE: the Webmin_Servers_Index documentation states "RPC can be used to run any command or modify any file on a server, which is why access to it must not be granted to un-trusted Webmin users."

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2019-15642"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-08-26T18:15:00Z",
    "severity": "HIGH"
  },
  "details": "rpc.cgi in Webmin through 1.920 allows authenticated Remote Code Execution via a crafted object name because unserialise_variable makes an eval call. NOTE: the Webmin_Servers_Index documentation states \"RPC can be used to run any command or modify any file on a server, which is why access to it must not be granted to un-trusted Webmin users.\"",
  "id": "GHSA-wf78-9xpm-m77r",
  "modified": "2024-04-04T01:48:10Z",
  "published": "2022-05-24T16:54:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-15642"
    },
    {
      "type": "WEB",
      "url": "https://github.com/webmin/webmin/commit/df8a43fb4bdc9c858874f72773bcba597ae9432c"
    },
    {
      "type": "WEB",
      "url": "https://doxfer.webmin.com/Webmin/Webmin_Servers_Index"
    },
    {
      "type": "WEB",
      "url": "https://github.com/webmin/webmin/blob/ab5e00e41ea1ecc1e24b8f8693f3495a0abb1aed/rpc.cgi#L26-L37"
    },
    {
      "type": "WEB",
      "url": "https://www.calypt.com/blog/index.php/authenticated-rce-on-webmin"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-WF8R-HQJ6-CR36

Vulnerability from github – Published: 2022-05-01 23:55 – Updated: 2022-05-01 23:55
VLAI
Details

Microsoft Office 2000 SP3, XP SP3, and 2003 SP2; Office Converter Pack; and Works 8 do not properly parse the length of a PICT file, which allows remote attackers to execute arbitrary code via a crafted PICT file, aka the "Malformed PICT Filter Vulnerability," a different vulnerability than CVE-2008-3021.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2008-3018"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2008-08-12T23:41:00Z",
    "severity": "HIGH"
  },
  "details": "Microsoft Office 2000 SP3, XP SP3, and 2003 SP2; Office Converter Pack; and Works 8 do not properly parse the length of a PICT file, which allows remote attackers to execute arbitrary code via a crafted PICT file, aka the \"Malformed PICT Filter Vulnerability,\" a different vulnerability than CVE-2008-3021.",
  "id": "GHSA-wf8r-hqj6-cr36",
  "modified": "2022-05-01T23:55:53Z",
  "published": "2022-05-01T23:55:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2008-3018"
    },
    {
      "type": "WEB",
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-044"
    },
    {
      "type": "WEB",
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5879"
    },
    {
      "type": "WEB",
      "url": "http://marc.info/?l=bugtraq\u0026m=121915960406986\u0026w=2"
    },
    {
      "type": "WEB",
      "url": "http://secunia.com/advisories/31336"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/30597"
    },
    {
      "type": "WEB",
      "url": "http://www.securitytracker.com/id?1020673"
    },
    {
      "type": "WEB",
      "url": "http://www.us-cert.gov/cas/techalerts/TA08-225A.html"
    },
    {
      "type": "WEB",
      "url": "http://www.vupen.com/english/advisories/2008/2348"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-WF9G-C67G-H4CH

Vulnerability from github – Published: 2024-09-12 15:33 – Updated: 2024-09-16 22:33
VLAI
Summary
MindsDB Eval Injection vulnerability
Details

An arbitrary code execution vulnerability exists in versions 23.10.5.0 up to 24.7.4.1 of the MindsDB platform, when the Microsoft SharePoint integration is installed on the server. For databases created with the SharePoint engine, an ‘INSERT’ query can be used for list item creation. If such a query is specially crafted to contain Python code and is run against the database, the code will be passed to an eval function and executed on the server.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "mindsdb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "23.10.5.0"
            },
            {
              "fixed": "24.7.4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-45851"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94",
      "CWE-95"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-09-12T17:03:51Z",
    "nvd_published_at": "2024-09-12T13:15:14Z",
    "severity": "HIGH"
  },
  "details": "An arbitrary code execution vulnerability exists in versions 23.10.5.0 up to 24.7.4.1 of the MindsDB platform, when the Microsoft SharePoint integration is installed on the server. For databases created with the SharePoint engine, an \u2018INSERT\u2019 query can be used for list item creation. If such a query is specially crafted to contain Python code and is run against the database, the code will be passed to an eval function and executed on the server.",
  "id": "GHSA-wf9g-c67g-h4ch",
  "modified": "2024-09-16T22:33:29Z",
  "published": "2024-09-12T15:33:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45851"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mindsdb/mindsdb/commit/11a4db792ad36cf704f7307c7602128b17752c80"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mindsdb/mindsdb"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/mindsdb/PYSEC-2024-81.yaml"
    },
    {
      "type": "WEB",
      "url": "https://hiddenlayer.com/sai-security-advisory/2024-09-mindsdb"
    }
  ],
  "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:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MindsDB Eval Injection vulnerability"
}

GHSA-WFC2-7FM3-V49C

Vulnerability from github – Published: 2025-03-05 06:31 – Updated: 2025-11-03 21:33
VLAI
Details

Vasion Print (formerly PrinterLogic) before Virtual Appliance Host 22.0.843 Application 20.0.1923 allows Client Remote Code Execution V-2023-001.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-27678"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-05T06:15:40Z",
    "severity": "CRITICAL"
  },
  "details": "Vasion Print (formerly PrinterLogic) before Virtual Appliance Host 22.0.843 Application 20.0.1923 allows Client Remote Code Execution V-2023-001.",
  "id": "GHSA-wfc2-7fm3-v49c",
  "modified": "2025-11-03T21:33:06Z",
  "published": "2025-03-05T06:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-27678"
    },
    {
      "type": "WEB",
      "url": "https://help.printerlogic.com/saas/Print/Security/Security-Bulletins.htm"
    },
    {
      "type": "WEB",
      "url": "https://pierrekim.github.io/blog/2025-04-08-vasion-printerlogic-83-vulnerabilities.html"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2025/Apr/18"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-WFGF-2Q6H-CJMV

Vulnerability from github – Published: 2022-05-02 06:17 – Updated: 2022-05-02 06:17
VLAI
Details

PHP remote file inclusion vulnerability in external.php in PHPCityPortal allows remote attackers to execute arbitrary PHP code via a URL in the url parameter.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2010-0975"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2010-03-16T19:00:00Z",
    "severity": "HIGH"
  },
  "details": "PHP remote file inclusion vulnerability in external.php in PHPCityPortal allows remote attackers to execute arbitrary PHP code via a URL in the url parameter.",
  "id": "GHSA-wfgf-2q6h-cjmv",
  "modified": "2022-05-02T06:17:38Z",
  "published": "2022-05-02T06:17:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2010-0975"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/56812"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.org/1003-exploits/phpcityportal-sqlrfi.txt"
    },
    {
      "type": "WEB",
      "url": "http://www.exploit-db.com/exploits/11678"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-WFGQ-222M-X2Q7

Vulnerability from github – Published: 2024-05-02 18:30 – Updated: 2026-04-08 18:33
VLAI
Details

The FOX – Currency Switcher Professional for WooCommerce plugin is vulnerable to Unauthenticated Arbitrary Shortcode Execution in versions up to, and including, 1.4.1.8. This allows unauthenticated attackers to execute arbitrary shortcodes. The severity and exploitability depends on what other plugins are installed and what shortcode functionality they provide.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-3734"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-02T17:15:30Z",
    "severity": "MODERATE"
  },
  "details": "The FOX \u2013 Currency Switcher Professional for WooCommerce plugin is vulnerable to Unauthenticated Arbitrary Shortcode Execution in versions up to, and including, 1.4.1.8. This allows unauthenticated attackers to execute arbitrary shortcodes. The severity and exploitability depends on what other plugins are installed and what shortcode functionality they provide.",
  "id": "GHSA-wfgq-222m-x2q7",
  "modified": "2026-04-08T18:33:05Z",
  "published": "2024-05-02T18:30:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-3734"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/woocommerce-currency-switcher/trunk/classes/woocs.php#L4154"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026new=3072307%40woocommerce-currency-switcher%2Ftrunk\u0026old=3049249%40woocommerce-currency-switcher%2Ftrunk\u0026sfp_email=\u0026sfph_mail="
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/4c1d49d0-c9aa-401c-80b9-d4df7fe97691?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-WFJF-PW48-WRHG

Vulnerability from github – Published: 2022-05-01 07:12 – Updated: 2022-05-01 07:12
VLAI
Details

PHP remote file inclusion vulnerability in performs.php in the perForms component (com_performs) 1.0 and earlier for Joomla! allows remote attackers to execute arbitrary PHP code via a URL in the mosConfig_absolute_path parameter.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2006-3774"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2006-07-24T12:19:00Z",
    "severity": "MODERATE"
  },
  "details": "PHP remote file inclusion vulnerability in performs.php in the perForms component (com_performs) 1.0 and earlier for Joomla! allows remote attackers to execute arbitrary PHP code via a URL in the mosConfig_absolute_path parameter.",
  "id": "GHSA-wfjf-pw48-wrhg",
  "modified": "2022-05-01T07:12:28Z",
  "published": "2022-05-01T07:12:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2006-3774"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/27724"
    },
    {
      "type": "WEB",
      "url": "http://secunia.com/advisories/21044"
    },
    {
      "type": "WEB",
      "url": "http://securityreason.com/securityalert/1263"
    },
    {
      "type": "WEB",
      "url": "http://securitytracker.com/id?1016498"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/archive/1/439997/100/100/threaded"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/18968"
    },
    {
      "type": "WEB",
      "url": "http://www.vupen.com/english/advisories/2006/2786"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-WFM3-G35W-6G75

Vulnerability from github – Published: 2024-05-14 18:30 – Updated: 2024-07-03 18:41
VLAI
Details

Cross Site Scripting vulnerability in php-lms/admin/?page=system_info in Computer Laboratory Management System using PHP and MySQL 1.0 allow remote attackers to inject arbitrary web script or HTML via the name, shortname parameters.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-34225"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-14T15:38:36Z",
    "severity": "MODERATE"
  },
  "details": "Cross Site Scripting vulnerability in php-lms/admin/?page=system_info in Computer Laboratory Management System using PHP and MySQL 1.0 allow remote attackers to inject arbitrary web script or HTML via the name, shortname parameters.",
  "id": "GHSA-wfm3-g35w-6g75",
  "modified": "2024-07-03T18:41:04Z",
  "published": "2024-05-14T18:30:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-34225"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dovankha/CVE-2024-34225"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-WFQH-5V9W-MCMR

Vulnerability from github – Published: 2023-09-22 21:30 – Updated: 2024-04-04 07:48
VLAI
Details

dst-admin v1.5.0 was discovered to contain a remote command execution (RCE) vulnerability via the userId parameter at /home/playerOperate.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-43270"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-09-22T19:15:11Z",
    "severity": "CRITICAL"
  },
  "details": "dst-admin v1.5.0 was discovered to contain a remote command execution (RCE) vulnerability via the userId parameter at /home/playerOperate.",
  "id": "GHSA-wfqh-5v9w-mcmr",
  "modified": "2024-04-04T07:48:27Z",
  "published": "2023-09-22T21:30:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-43270"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Libestor/someCVE/tree/main/dst-admin-RCE"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Mitigation
Architecture and Design

Strategy: Refactoring

Refactor your program so that you do not have to dynamically generate code.

Mitigation
Architecture and Design
  • Run your code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which code can be executed by your product.
  • Examples include the Unix chroot jail and AppArmor. In general, managed code may provide some protection.
  • This may not be a feasible solution, and it only limits the impact to the operating system; the rest of your application may still be subject to compromise.
  • Be careful to avoid CWE-243 and other weaknesses related to jails.
Mitigation MIT-5
Implementation

Strategy: Input Validation

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
  • To reduce the likelihood of code injection, use stringent allowlists that limit which constructs are allowed. If you are dynamically constructing code that invokes a function, then verifying that the input is alphanumeric might be insufficient. An attacker might still be able to reference a dangerous function that you did not intend to allow, such as system(), exec(), or exit().
Mitigation
Testing

Use dynamic tools and techniques that interact with the product using large test suites with many diverse inputs, such as fuzz testing (fuzzing), robustness testing, and fault injection. The product's operation may slow down, but it should not become unstable, crash, or generate incorrect results.

Mitigation MIT-32
Operation

Strategy: Compilation or Build Hardening

Run the code in an environment that performs automatic taint propagation and prevents any command execution that uses tainted variables, such as Perl's "-T" switch. This will force the program to perform validation steps that remove the taint, although you must be careful to correctly validate your inputs so that you do not accidentally mark dangerous inputs as untainted (see CWE-183 and CWE-184).

Mitigation MIT-32
Operation

Strategy: Environment Hardening

Run the code in an environment that performs automatic taint propagation and prevents any command execution that uses tainted variables, such as Perl's "-T" switch. This will force the program to perform validation steps that remove the taint, although you must be careful to correctly validate your inputs so that you do not accidentally mark dangerous inputs as untainted (see CWE-183 and CWE-184).

Mitigation
Implementation

For Python programs, it is frequently encouraged to use the ast.literal_eval() function instead of eval, since it is intentionally designed to avoid executing code. However, an adversary could still cause excessive memory or stack consumption via deeply nested structures [REF-1372], so the python documentation discourages use of ast.literal_eval() on untrusted data [REF-1373].

CAPEC-242: Code Injection

An adversary exploits a weakness in input validation on the target to inject new code into that which is currently executing. This differs from code inclusion in that code inclusion involves the addition or replacement of a reference to a code file, which is subsequently loaded by the target and used as part of the code of some application.

CAPEC-35: Leverage Executable Code in Non-Executable Files

An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.

CAPEC-77: Manipulating User-Controlled Variables

This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An adversary can override variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the adversary can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.