Common Weakness Enumeration

CWE-98

Allowed

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')

Abstraction: Variant · Status: Draft

API response cwe.mitre.org

The PHP application receives input from an upstream component, but it does not restrict or incorrectly restricts the input before its usage in "require," "include," or similar functions.

2484 vulnerabilities reference this CWE, most recent first.

GHSA-GQGJ-VRH4-F89W

Vulnerability from github – Published: 2026-02-03 15:30 – Updated: 2026-02-04 21:30
VLAI
Details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in ThemeMove Unicamp unicamp allows PHP Local File Inclusion.This issue affects Unicamp: from n/a through <= 2.7.1.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-25027"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-03T15:16:21Z",
    "severity": "HIGH"
  },
  "details": "Improper Control of Filename for Include/Require Statement in PHP Program (\u0027PHP Remote File Inclusion\u0027) vulnerability in ThemeMove Unicamp unicamp allows PHP Local File Inclusion.This issue affects Unicamp: from n/a through \u003c= 2.7.1.",
  "id": "GHSA-gqgj-vrh4-f89w",
  "modified": "2026-02-04T21:30:30Z",
  "published": "2026-02-03T15:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25027"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/Wordpress/Theme/unicamp/vulnerability/wordpress-unicamp-theme-2-7-1-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GQGV-6V92-8J2R

Vulnerability from github – Published: 2025-06-20 15:30 – Updated: 2026-04-01 18:35
VLAI
Details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in RadiusTheme Classified Listing allows PHP Local File Inclusion. This issue affects Classified Listing: from n/a through 4.2.0.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-52715"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-20T15:15:32Z",
    "severity": "HIGH"
  },
  "details": "Improper Control of Filename for Include/Require Statement in PHP Program (\u0027PHP Remote File Inclusion\u0027) vulnerability in RadiusTheme Classified Listing allows PHP Local File Inclusion. This issue affects Classified Listing: from n/a through 4.2.0.",
  "id": "GHSA-gqgv-6v92-8j2r",
  "modified": "2026-04-01T18:35:33Z",
  "published": "2025-06-20T15:30:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-52715"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/plugin/classified-listing/vulnerability/wordpress-classified-listing-plugin-4-2-0-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GQQP-7V9R-JWF2

Vulnerability from github – Published: 2025-04-10 09:30 – Updated: 2026-04-01 18:34
VLAI
Details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in Ashan Perera EventON. This issue affects EventON: from n/a through 2.3.2.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-32160"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-10T08:15:16Z",
    "severity": "HIGH"
  },
  "details": "Improper Control of Filename for Include/Require Statement in PHP Program (\u0027PHP Remote File Inclusion\u0027) vulnerability in Ashan Perera EventON. This issue affects EventON: from n/a through 2.3.2.",
  "id": "GHSA-gqqp-7v9r-jwf2",
  "modified": "2026-04-01T18:34:39Z",
  "published": "2025-04-10T09:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-32160"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/plugin/eventon-lite/vulnerability/wordpress-eventon-plugin-2-3-2-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GQWC-X2HG-Q3W4

Vulnerability from github – Published: 2026-03-05 06:30 – Updated: 2026-03-09 18:31
VLAI
Details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in axiomthemes AC Services | HVAC, Air Conditioning & Heating Company WordPress Theme window-ac-services allows PHP Local File Inclusion.This issue affects AC Services | HVAC, Air Conditioning & Heating Company WordPress Theme: from n/a through <= 1.2.5.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-27326"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-05T06:16:23Z",
    "severity": "HIGH"
  },
  "details": "Improper Control of Filename for Include/Require Statement in PHP Program (\u0027PHP Remote File Inclusion\u0027) vulnerability in axiomthemes AC Services | HVAC, Air Conditioning \u0026 Heating Company WordPress Theme window-ac-services allows PHP Local File Inclusion.This issue affects AC Services | HVAC, Air Conditioning \u0026 Heating Company WordPress Theme: from n/a through \u003c= 1.2.5.",
  "id": "GHSA-gqwc-x2hg-q3w4",
  "modified": "2026-03-09T18:31:37Z",
  "published": "2026-03-05T06:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27326"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/Wordpress/Theme/window-ac-services/vulnerability/wordpress-ac-services-hvac-air-conditioning-heating-company-wordpress-theme-theme-1-2-5-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GR2H-3Q4J-6JMQ

Vulnerability from github – Published: 2026-06-19 18:32 – Updated: 2026-06-19 18:32
VLAI
Details

Joomla! Component Easy Shop 1.2.3 contains a local file inclusion vulnerability that allows unauthenticated attackers to read arbitrary files by supplying base64-encoded file paths. Attackers can send GET requests to index.php with the option parameter set to com_easyshop, task set to ajax.loadImage, and a base64-encoded file path in the file parameter to retrieve sensitive files like configuration.php and system files.

Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.9 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [],
  "aliases": [
    "CVE-2019-25760"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-19T18:16:18Z",
    "severity": "MODERATE"
  },
  "details": "Joomla! Component Easy Shop 1.2.3 contains a local file inclusion vulnerability that allows unauthenticated attackers to read arbitrary files by supplying base64-encoded file paths. Attackers can send GET requests to index.php with the option parameter set to com_easyshop, task set to ajax.loadImage, and a base64-encoded file path in the file parameter to retrieve sensitive files like configuration.php and system files.",
  "id": "GHSA-gr2h-3q4j-6jmq",
  "modified": "2026-06-19T18:32:35Z",
  "published": "2026-06-19T18:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-25760"
    },
    {
      "type": "WEB",
      "url": "https://extensions.joomla.org/extensions/extension/e-commerce/shopping-cart/easy-shop"
    },
    {
      "type": "WEB",
      "url": "https://joomtech.net"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/46219"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/joomla-component-easy-shop-local-file-inclusion"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-GR8H-X6CH-P7GJ

Vulnerability from github – Published: 2024-07-09 15:30 – Updated: 2026-04-01 18:31
VLAI
Details

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in RadiusTheme ShopBuilder – Elementor WooCommerce Builder Addons allows Path Traversal.This issue affects ShopBuilder – Elementor WooCommerce Builder Addons: from n/a through 2.1.12.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2024-37520"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-09T13:15:10Z",
    "severity": "MODERATE"
  },
  "details": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027) vulnerability in RadiusTheme ShopBuilder \u2013 Elementor WooCommerce Builder Addons allows Path Traversal.This issue affects ShopBuilder \u2013 Elementor WooCommerce Builder Addons: from n/a through 2.1.12.",
  "id": "GHSA-gr8h-x6ch-p7gj",
  "modified": "2026-04-01T18:31:51Z",
  "published": "2024-07-09T15:30:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-37520"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/Wordpress/Plugin/shopbuilder/vulnerability/wordpress-shopbuilder-elementor-woocommerce-builder-addons-plugin-2-1-12-local-file-inclusion-vulnerability?_s_id=cve"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/vulnerability/shopbuilder/wordpress-shopbuilder-elementor-woocommerce-builder-addons-plugin-2-1-12-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "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:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GV25-7GVW-4P47

Vulnerability from github – Published: 2025-05-19 21:30 – Updated: 2026-04-01 18:35
VLAI
Details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in Indie_Plugins WhatsApp Click to Chat Plugin for WordPress.This issue affects WhatsApp Click to Chat Plugin for WordPress: from n/a through 2.2.12.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-39411"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-19T19:15:49Z",
    "severity": "HIGH"
  },
  "details": "Improper Control of Filename for Include/Require Statement in PHP Program (\u0027PHP Remote File Inclusion\u0027) vulnerability in Indie_Plugins WhatsApp Click to Chat Plugin for WordPress.This issue affects WhatsApp Click to Chat Plugin for WordPress: from n/a through 2.2.12.",
  "id": "GHSA-gv25-7gvw-4p47",
  "modified": "2026-04-01T18:35:12Z",
  "published": "2025-05-19T21:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39411"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/plugin/wpt-whatsapp/vulnerability/wordpress-whatsapp-click-to-chat-plugin-for-wordpress-plugin-2-2-12-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GVQ9-X998-GJ3M

Vulnerability from github – Published: 2026-01-05 12:30 – Updated: 2026-04-01 18:36
VLAI
Details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in jwsthemes FreeAgent allows PHP Local File Inclusion.This issue affects FreeAgent: from n/a through 2.1.2.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2025-69087"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-05T11:17:42Z",
    "severity": "HIGH"
  },
  "details": "Improper Control of Filename for Include/Require Statement in PHP Program (\u0027PHP Remote File Inclusion\u0027) vulnerability in jwsthemes FreeAgent allows PHP Local File Inclusion.This issue affects FreeAgent: from n/a through 2.1.2.",
  "id": "GHSA-gvq9-x998-gj3m",
  "modified": "2026-04-01T18:36:31Z",
  "published": "2026-01-05T12:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-69087"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/theme/freeagent/vulnerability/wordpress-freeagent-theme-2-1-2-local-file-inclusion-vulnerability?_s_id=cve"
    },
    {
      "type": "WEB",
      "url": "https://vdp.patchstack.com/database/wordpress/theme/freeagent/vulnerability/wordpress-freeagent-theme-2-1-2-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GW2X-337G-Q8X9

Vulnerability from github – Published: 2025-08-20 09:30 – Updated: 2026-04-01 18:35
VLAI
Details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in WP Travel WP Travel Gutenberg Blocks allows PHP Local File Inclusion. This issue affects WP Travel Gutenberg Blocks: from n/a through 3.9.0.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2025-53207"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-20T08:15:40Z",
    "severity": "HIGH"
  },
  "details": "Improper Control of Filename for Include/Require Statement in PHP Program (\u0027PHP Remote File Inclusion\u0027) vulnerability in WP Travel WP Travel Gutenberg Blocks allows PHP Local File Inclusion. This issue affects WP Travel Gutenberg Blocks: from n/a through 3.9.0.",
  "id": "GHSA-gw2x-337g-q8x9",
  "modified": "2026-04-01T18:35:55Z",
  "published": "2025-08-20T09:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53207"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/plugin/wp-travel-blocks/vulnerability/wordpress-wp-travel-gutenberg-blocks-3-9-0-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GW5Q-G722-HR5X

Vulnerability from github – Published: 2026-03-25 18:31 – Updated: 2026-03-26 21:31
VLAI
Details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in ThemeREX Nelson nelson allows PHP Local File Inclusion.This issue affects Nelson: from n/a through <= 1.2.0.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-22503"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-98"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-25T17:16:32Z",
    "severity": "HIGH"
  },
  "details": "Improper Control of Filename for Include/Require Statement in PHP Program (\u0027PHP Remote File Inclusion\u0027) vulnerability in ThemeREX Nelson nelson allows PHP Local File Inclusion.This issue affects Nelson: from n/a through \u003c= 1.2.0.",
  "id": "GHSA-gw5q-g722-hr5x",
  "modified": "2026-03-26T21:31:24Z",
  "published": "2026-03-25T18:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22503"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/Wordpress/Theme/nelson/vulnerability/wordpress-nelson-theme-1-2-0-local-file-inclusion-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}
Mitigation MIT-4
Architecture and Design

Strategy: Libraries or Frameworks

Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].

Mitigation MIT-21.1
Architecture and Design

Strategy: Enforcement by Conversion

  • When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
  • For example, ID 1 could map to "inbox.txt" and ID 2 could map to "profile.txt". Features such as the ESAPI AccessReferenceMap [REF-185] provide this capability.
Mitigation MIT-15
Architecture and Design

For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.

Mitigation MIT-22
Architecture and Design Operation

Strategy: Sandbox or Jail

  • Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
  • OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
  • This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
  • Be careful to avoid CWE-243 and other weaknesses related to jails.
Mitigation MIT-17
Architecture and Design Operation

Strategy: Environment Hardening

Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.

Mitigation MIT-5.1
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.
  • When validating filenames, use stringent lists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
  • Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.
Mitigation MIT-34
Architecture and Design Operation

Strategy: Attack Surface Reduction

  • Store library, include, and utility files outside of the web document root, if possible. Otherwise, store them in a separate directory and use the web server's access control capabilities to prevent attackers from directly requesting them. One common practice is to define a fixed constant in each calling program, then check for the existence of the constant in the library/include file; if the constant does not exist, then the file was directly requested, and it can exit immediately.
  • This significantly reduces the chance of an attacker being able to bypass any protection mechanisms that are in the base program but not in the include files. It will also reduce the attack surface.
Mitigation MIT-6
Architecture and Design Implementation

Strategy: Attack Surface Reduction

  • Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
  • Many file inclusion problems occur because the programmer assumed that certain inputs could not be modified, especially for cookies and URL components.
Mitigation MIT-29
Operation

Strategy: Firewall

Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].

Mitigation
Operation Implementation

Strategy: Environment Hardening

Develop and run your code in the most recent versions of PHP available, preferably PHP 6 or later. Many of the highly risky features in earlier PHP interpreters have been removed, restricted, or disabled by default.

Mitigation MIT-16
Operation Implementation

Strategy: Environment Hardening

  • When using PHP, configure the application so that it does not use register_globals. During implementation, develop the application so that it does not rely on this feature, but be wary of implementing a register_globals emulation that is subject to weaknesses such as CWE-95, CWE-621, and similar issues.
  • Often, programmers do not protect direct access to files intended only to be included by core programs. These include files may assume that critical variables have already been initialized by the calling program. As a result, the use of register_globals combined with the ability to directly access the include file may allow attackers to conduct file inclusion attacks. This remains an extremely common pattern as of 2009.
Mitigation
Operation

Strategy: Environment Hardening

Set allow_url_fopen to false, which limits the ability to include files from remote locations.

CAPEC-193: PHP Remote File Inclusion

In this pattern the adversary is able to load and execute arbitrary code remotely available from the application. This is usually accomplished through an insecurely configured PHP runtime environment and an improperly sanitized "include" or "require" call, which the user can then control to point to any web-accessible file. This allows adversaries to hijack the targeted application and force it to execute their own instructions.

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