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.

8301 vulnerabilities reference this CWE, most recent first.

GHSA-MQ5P-2MCR-M52J

Vulnerability from github – Published: 2021-08-30 16:17 – Updated: 2024-10-03 21:28
VLAI
Summary
Code injection in nbgitpuller
Details

Impact

Due to an unsanitized input, visiting maliciously crafted links could result in arbitrary code execution in the user environment.

Patches

0.10.2

Workarounds

None, other than upgrade to 0.10.2 or downgrade to 0.8.x.

For more information

If you have any questions or comments about this advisory:

Show details on source website

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.10.1"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "nbgitpuller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.0"
            },
            {
              "fixed": "0.10.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-39160"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-08-25T15:10:01Z",
    "nvd_published_at": "2021-08-25T18:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nDue to an unsanitized input, visiting maliciously crafted links could result in arbitrary code execution in the user environment.\n\n### Patches\n\n0.10.2\n\n### Workarounds\n\nNone, other than upgrade to 0.10.2 or downgrade to 0.8.x.\n\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue in [nbgitpuller](https://github.com/jupyterhub/nbgitpuller/issues)\n* Email our security team at [security@ipython.org](mailto:security@ipython.org)\n",
  "id": "GHSA-mq5p-2mcr-m52j",
  "modified": "2024-10-03T21:28:36Z",
  "published": "2021-08-30T16:17:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/nbgitpuller/security/advisories/GHSA-mq5p-2mcr-m52j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-39160"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/nbgitpuller/commit/07690644f29a566011dd0d7ba14cae3eb0490481"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/jupyterhub/nbgitpuller"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/nbgitpuller/blob/main/CHANGELOG.md#0102---2021-08-25"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/nbgitpuller/PYSEC-2021-315.yaml"
    }
  ],
  "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": "Code injection in nbgitpuller"
}

GHSA-MQ78-P977-PWGV

Vulnerability from github – Published: 2025-03-20 12:32 – Updated: 2025-03-20 12:32
VLAI
Details

SuperAGI is vulnerable to remote code execution in the latest version. The agent template update API allows attackers to control certain parameters, which are then fed to the eval function without any sanitization or checks in place. This vulnerability can lead to full system compromise.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-9439"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-20T10:15:49Z",
    "severity": "HIGH"
  },
  "details": "SuperAGI is vulnerable to remote code execution in the latest version. The `agent template update` API allows attackers to control certain parameters, which are then fed to the eval function without any sanitization or checks in place. This vulnerability can lead to full system compromise.",
  "id": "GHSA-mq78-p977-pwgv",
  "modified": "2025-03-20T12:32:51Z",
  "published": "2025-03-20T12:32:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-9439"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/d710884f-b5ab-4b31-a2e6-e4b38488def1"
    }
  ],
  "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-MQ7H-FM69-H6XQ

Vulnerability from github – Published: 2024-07-03 21:39 – Updated: 2024-07-08 15:31
VLAI
Details

An issue was discovered in Artifex Ghostscript before 10.03.1. contrib/opvp/gdevopvp.c allows arbitrary code execution via a custom Driver library, exploitable via a crafted PostScript document. This occurs because the Driver parameter for opvp (and oprp) devices can have an arbitrary name for a dynamic library; this library is then loaded.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-33871"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-03T19:15:03Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in Artifex Ghostscript before 10.03.1. contrib/opvp/gdevopvp.c allows arbitrary code execution via a custom Driver library, exploitable via a crafted PostScript document. This occurs because the Driver parameter for opvp (and oprp) devices can have an arbitrary name for a dynamic library; this library is then loaded.",
  "id": "GHSA-mq7h-fm69-h6xq",
  "modified": "2024-07-08T15:31:55Z",
  "published": "2024-07-03T21:39:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-33871"
    },
    {
      "type": "WEB",
      "url": "https://bugs.ghostscript.com/show_bug.cgi?id=707754"
    },
    {
      "type": "WEB",
      "url": "https://cgit.ghostscript.com/cgi-bin/cgit.cgi/ghostpdl.git/commit/?id=7145885041bb52cc23964f0aa2aec1b1c82b5908"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2024/06/28/2"
    }
  ],
  "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"
    }
  ]
}

GHSA-MQ99-924G-FQ3X

Vulnerability from github – Published: 2024-04-11 06:30 – Updated: 2024-07-09 18:30
VLAI
Details

A cross-site scripting (XSS) vulnerability in RageFrame2 v2.6.43, allows remote attackers to execute arbitrary web scripts or HTML and obtain sensitive information via a crafted payload injected into the upload_drive parameter.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-30878"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-11T05:15:47Z",
    "severity": "MODERATE"
  },
  "details": "A cross-site scripting (XSS) vulnerability in RageFrame2 v2.6.43, allows remote attackers to execute arbitrary web scripts or HTML and obtain sensitive information via a crafted payload injected into the upload_drive parameter.",
  "id": "GHSA-mq99-924g-fq3x",
  "modified": "2024-07-09T18:30:42Z",
  "published": "2024-04-11T06:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-30878"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jianyan74/rageframe2/issues/111"
    }
  ],
  "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-MQ9M-4HG9-C34X

Vulnerability from github – Published: 2024-03-19 12:30 – Updated: 2024-10-30 18:30
VLAI
Details

Using a markup injection an attacker could have stolen nonce values. This could have been used to bypass strict content security policies. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-2610"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-03-19T12:15:08Z",
    "severity": "MODERATE"
  },
  "details": "Using a markup injection an attacker could have stolen nonce values. This could have been used to bypass strict content security policies. This vulnerability affects Firefox \u003c 124, Firefox ESR \u003c 115.9, and Thunderbird \u003c 115.9.",
  "id": "GHSA-mq9m-4hg9-c34x",
  "modified": "2024-10-30T18:30:44Z",
  "published": "2024-03-19T12:30:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-2610"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1871112"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2024-12"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2024-13"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2024-14"
    }
  ],
  "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-MQGH-XH6M-9QMC

Vulnerability from github – Published: 2022-05-02 03:18 – Updated: 2022-05-02 03:18
VLAI
Details

Insecure method vulnerability in the SopCast SopCore ActiveX control in sopocx.ocx 3.0.3.501 allows remote attackers to execute arbitrary programs via an executable file name in the argument to the SetExternalPlayer method.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2009-0811"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2009-03-04T17:30:00Z",
    "severity": "HIGH"
  },
  "details": "Insecure method vulnerability in the SopCast SopCore ActiveX control in sopocx.ocx 3.0.3.501 allows remote attackers to execute arbitrary programs via an executable file name in the argument to the SetExternalPlayer method.",
  "id": "GHSA-mqgh-xh6m-9qmc",
  "modified": "2022-05-02T03:18:36Z",
  "published": "2022-05-02T03:18:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2009-0811"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/48955"
    },
    {
      "type": "WEB",
      "url": "http://retrogod.altervista.org/9sg_sopcastia.html"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/archive/1/501252/100/0/threaded"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/33920"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-MQMR-46GM-2W7Q

Vulnerability from github – Published: 2022-05-02 06:11 – Updated: 2024-02-02 03:30
VLAI
Details

Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 do not properly parse the Excel file format, which allows remote attackers to execute arbitrary code via a crafted spreadsheet that causes memory to be interpreted as a different object type than intended, aka "Microsoft Office Excel Sheet Object Type Confusion Vulnerability."

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2010-0258"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-843",
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2010-03-10T22:30:00Z",
    "severity": "HIGH"
  },
  "details": "Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 do not properly parse the Excel file format, which allows remote attackers to execute arbitrary code via a crafted spreadsheet that causes memory to be interpreted as a different object type than intended, aka \"Microsoft Office Excel Sheet Object Type Confusion Vulnerability.\"",
  "id": "GHSA-mqmr-46gm-2w7q",
  "modified": "2024-02-02T03:30:31Z",
  "published": "2022-05-02T06:11:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2010-0258"
    },
    {
      "type": "WEB",
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-017"
    },
    {
      "type": "WEB",
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8545"
    },
    {
      "type": "WEB",
      "url": "http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=859"
    },
    {
      "type": "WEB",
      "url": "http://www.securitytracker.com/id?1023698"
    },
    {
      "type": "WEB",
      "url": "http://www.us-cert.gov/cas/techalerts/TA10-068A.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-MQP2-8CH3-3446

Vulnerability from github – Published: 2026-01-30 00:31 – Updated: 2026-01-30 00:31
VLAI
Details

A code injection in Ivanti Endpoint Manager Mobile allowing attackers to achieve unauthenticated remote code execution.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-1281"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-29T22:15:53Z",
    "severity": "CRITICAL"
  },
  "details": "A code injection in Ivanti Endpoint Manager Mobile allowing attackers to achieve unauthenticated remote code execution.",
  "id": "GHSA-mqp2-8ch3-3446",
  "modified": "2026-01-30T00:31:23Z",
  "published": "2026-01-30T00:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1281"
    },
    {
      "type": "WEB",
      "url": "https://forums.ivanti.com/s/article/Security-Advisory-Ivanti-Endpoint-Manager-Mobile-EPMM-CVE-2026-1281-CVE-2026-1340"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-1281"
    }
  ],
  "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-MQP9-66JV-CCJ2

Vulnerability from github – Published: 2024-02-29 03:33 – Updated: 2024-08-01 15:31
VLAI
Details

SQL Injection vulnerability in the Simple Student Attendance System v.1.0 allows a remote attacker to execute arbitrary code via a crafted payload to the id parameter in the student_form.php and the class_form.php pages.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-51801"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-29T02:15:09Z",
    "severity": "CRITICAL"
  },
  "details": "SQL Injection vulnerability in the Simple Student Attendance System v.1.0 allows a remote attacker to execute arbitrary code via a crafted payload to the id parameter in the student_form.php and the class_form.php pages.",
  "id": "GHSA-mqp9-66jv-ccj2",
  "modified": "2024-08-01T15:31:29Z",
  "published": "2024-02-29T03:33:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-51801"
    },
    {
      "type": "WEB",
      "url": "https://github.com/geraldoalcantara/CVE-2023-51801"
    }
  ],
  "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-MQQH-4PFQ-F7MP

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

PHP remote file inclusion vulnerability in index.php in Textpattern CMS 4.2.0 allows remote attackers to execute arbitrary PHP code via a URL in the inc parameter.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2010-3205"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2010-09-03T18:00:00Z",
    "severity": "HIGH"
  },
  "details": "PHP remote file inclusion vulnerability in index.php in Textpattern CMS 4.2.0 allows remote attackers to execute arbitrary PHP code via a URL in the inc parameter.",
  "id": "GHSA-mqqh-4pfq-f7mp",
  "modified": "2022-05-17T02:05:42Z",
  "published": "2022-05-17T02:05:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2010-3205"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/61475"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.org/1008-exploits/textpattern-rfi.txt"
    },
    {
      "type": "WEB",
      "url": "http://www.exploit-db.com/exploits/14823"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.