Common Weakness Enumeration

CWE-287

Discouraged

Improper Authentication

Abstraction: Class · Status: Draft

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

5977 vulnerabilities reference this CWE, most recent first.

GHSA-FPX3-PCR2-8RVR

Vulnerability from github – Published: 2022-05-24 17:46 – Updated: 2022-05-24 17:46
VLAI
Details

The Plus Addons for Elementor Page Builder WordPress plugin before 4.1.7 was being actively exploited to by malicious actors to bypass authentication, allowing unauthenticated users to log in as any user (including admin) by just providing the related username, as well as create accounts with arbitrary roles, such as admin. These issues can be exploited even if registration is disabled, and the Login widget is not active.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2021-24175"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-04-05T19:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "The Plus Addons for Elementor Page Builder WordPress plugin before 4.1.7 was being actively exploited to by malicious actors to bypass authentication, allowing unauthenticated users to log in as any user (including admin) by just providing the related username, as well as create accounts with arbitrary roles, such as admin. These issues can be exploited even if registration is disabled, and the Login widget is not active.",
  "id": "GHSA-fpx3-pcr2-8rvr",
  "modified": "2022-05-24T17:46:32Z",
  "published": "2022-05-24T17:46:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-24175"
    },
    {
      "type": "WEB",
      "url": "https://posimyth.ticksy.com/ticket/2713734"
    },
    {
      "type": "WEB",
      "url": "https://wpscan.com/vulnerability/c311feef-7041-4c21-9525-132b9bd32f89"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/blog/2021/03/critical-0-day-in-the-plus-addons-for-elementor-allows-site-takeover"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-FQ2Q-8MQ9-5RFH

Vulnerability from github – Published: 2022-05-24 16:49 – Updated: 2022-05-24 16:49
VLAI
Details

An issue was discovered on D-Link DCS-1130 and DCS-1100 devices. The binary rtspd in /sbin folder of the device handles all the rtsp connections received by the device. It seems that the binary loads at address 0x00012CF4 a flag called "Authenticate" that indicates whether a user should be authenticated or not before allowing access to the video feed. By default, the value for this flag is zero and can be set/unset using the HTTP interface and network settings tab as shown below. The device requires that a user logging to the HTTP management interface of the device to provide a valid username and password. However, the device does not enforce the same restriction by default on RTSP URL due to the checkbox unchecked by default, thereby allowing any attacker in possession of external IP address of the camera to view the live video feed. The severity of this attack is enlarged by the fact that there more than 100,000 D-Link devices out there.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2017-8405"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-07-02T20:15:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered on D-Link DCS-1130 and DCS-1100 devices. The binary rtspd in /sbin folder of the device handles all the rtsp connections received by the device. It seems that the binary loads at address 0x00012CF4 a flag called \"Authenticate\" that indicates whether a user should be authenticated or not before allowing access to the video feed. By default, the value for this flag is zero and can be set/unset using the HTTP interface and network settings tab as shown below. The device requires that a user logging to the HTTP management interface of the device to provide a valid username and password. However, the device does not enforce the same restriction by default on RTSP URL due to the checkbox unchecked by default, thereby allowing any attacker in possession of external IP address of the camera to view the live video feed. The severity of this attack is enlarged by the fact that there more than 100,000 D-Link devices out there.",
  "id": "GHSA-fq2q-8mq9-5rfh",
  "modified": "2022-05-24T16:49:13Z",
  "published": "2022-05-24T16:49:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-8405"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Dlink_DCS_1130_security.pdf"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/bugtraq/2019/Jun/8"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.com/files/153226/Dlink-DCS-1130-Command-Injection-CSRF-Stack-Overflow.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-FQ5F-CFQM-MRRQ

Vulnerability from github – Published: 2022-05-24 16:53 – Updated: 2024-04-04 01:40
VLAI
Details

Arista EOS through 4.21.0F allows a crash because 802.1x authentication is mishandled.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2018-14008"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-08-15T17:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Arista EOS through 4.21.0F allows a crash because 802.1x authentication is mishandled.",
  "id": "GHSA-fq5f-cfqm-mrrq",
  "modified": "2024-04-04T01:40:06Z",
  "published": "2022-05-24T16:53:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-14008"
    },
    {
      "type": "WEB",
      "url": "https://www.arista.com/en/support/advisories-notices"
    },
    {
      "type": "WEB",
      "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/6072-security-advisory-38"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-FQ75-H86R-46HG

Vulnerability from github – Published: 2022-05-14 01:26 – Updated: 2025-04-12 12:32
VLAI
Details

Secure Transport in Apple iOS before 7.1.1, Apple OS X 10.8.x and 10.9.x through 10.9.2, and Apple TV before 6.1.1 does not ensure that a server's X.509 certificate is the same during renegotiation as it was before renegotiation, which allows man-in-the-middle attackers to obtain sensitive information or modify TLS session data via a "triple handshake attack."

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2014-1295"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2014-04-23T11:52:00Z",
    "severity": "MODERATE"
  },
  "details": "Secure Transport in Apple iOS before 7.1.1, Apple OS X 10.8.x and 10.9.x through 10.9.2, and Apple TV before 6.1.1 does not ensure that a server\u0027s X.509 certificate is the same during renegotiation as it was before renegotiation, which allows man-in-the-middle attackers to obtain sensitive information or modify TLS session data via a \"triple handshake attack.\"",
  "id": "GHSA-fq75-h86r-46hg",
  "modified": "2025-04-12T12:32:56Z",
  "published": "2022-05-14T01:26:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2014-1295"
    },
    {
      "type": "WEB",
      "url": "https://secure-resumption.com"
    },
    {
      "type": "WEB",
      "url": "http://archives.neohapsis.com/archives/bugtraq/2014-04/0134.html"
    },
    {
      "type": "WEB",
      "url": "http://archives.neohapsis.com/archives/bugtraq/2014-04/0135.html"
    },
    {
      "type": "WEB",
      "url": "http://archives.neohapsis.com/archives/bugtraq/2014-04/0136.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-FQH7-W8JC-QQJJ

Vulnerability from github – Published: 2023-12-12 03:31 – Updated: 2023-12-14 00:30
VLAI
Details

Missing authentication in the internal data streaming system in ProLion CryptoSpike 3.0.15P2 allows remote unauthenticated users to read potentially sensitive information and deny service to users by directly reading and writing data in Apache Kafka (as consumer and producer).

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-36648"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-12-12T01:15:10Z",
    "severity": "HIGH"
  },
  "details": "Missing authentication in the internal data streaming system in ProLion CryptoSpike 3.0.15P2 allows remote unauthenticated users to read potentially sensitive information and deny service to users by directly reading and writing data in Apache Kafka (as consumer and producer).",
  "id": "GHSA-fqh7-w8jc-qqjj",
  "modified": "2023-12-14T00:30:25Z",
  "published": "2023-12-12T03:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-36648"
    },
    {
      "type": "WEB",
      "url": "https://www.cvcn.gov.it/cvcn/cve/CVE-2023-36648"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-FQPP-WF47-38VW

Vulnerability from github – Published: 2022-06-08 00:00 – Updated: 2022-06-17 00:01
VLAI
Details

A vulnerability in the application authentication and authorization mechanism in Hitachi Energy's TXpert Hub CoreTec 4, that depends on a token validation of the session identifier, allows an unauthorized modified message to be executed in the server enabling an unauthorized actor to change an existing user password, and further gain authorized access into the system via login mechanism. This issue affects: Hitachi Energy TXpert Hub CoreTec 4 version 2.0.0 2.1.0; 2.1.0; 2.1.1; 2.1.2; 2.1.3; 2.2.0; 2.2.1.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2021-35530"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287",
      "CWE-288"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-06-07T21:15:00Z",
    "severity": "HIGH"
  },
  "details": "A vulnerability in the application authentication and authorization mechanism in Hitachi Energy\u0027s TXpert Hub CoreTec 4, that depends on a token validation of the session identifier, allows an unauthorized modified message to be executed in the server enabling an unauthorized actor to change an existing user password, and further gain authorized access into the system via login mechanism. This issue affects: Hitachi Energy TXpert Hub CoreTec 4 version 2.0.0 2.1.0; 2.1.0; 2.1.1; 2.1.2; 2.1.3; 2.2.0; 2.2.1.",
  "id": "GHSA-fqpp-wf47-38vw",
  "modified": "2022-06-17T00:01:28Z",
  "published": "2022-06-08T00:00:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-35530"
    },
    {
      "type": "WEB",
      "url": "https://search.abb.com/library/Download.aspx?DocumentID=8DBD000080\u0026LanguageCode=en\u0026DocumentPartId=\u0026Action=Launch\u0026utm_campaign=\u0026utm_content=2022.04_5763_Cybersecurity%20Advisory%20Update_May_03\u0026utm_medium=email\u0026utm_source=Eloqua"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-FQRJ-M88P-QF3V

Vulnerability from github – Published: 2026-04-07 18:14 – Updated: 2026-04-07 18:14
VLAI
Summary
OpenClaw: Zalo replay dedupe cache could suppress events across authenticated webhook targets
Details

Summary

Before OpenClaw 2026.3.31, the Zalo webhook replay-dedupe cache was shared across authenticated webhook targets and keyed too broadly. In multi-account deployments, a replay seen on one account could suppress a legitimate event on another account if event_name and message_id matched.

Impact

An attacker who controlled one authenticated Zalo webhook path in a multi-account gateway deployment could cause silent message suppression on a different Zalo account sharing that gateway. This was an availability issue; it did not provide cross-account authentication or data access.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: >= 2026.2.19, < 2026.3.31
  • Patched versions: >= 2026.3.31
  • Latest published npm version: 2026.4.1

Fix Commit(s)

  • 4d038bb242c11f39e45f6a4bde400e5fd42e4ebf — scope webhook replay dedupe per target
  • 7cea7c29705b188b464cc9cdc107c275b94b2a72 — follow-up hardening to scope replay dedupe by path and account

Release Process Note

The initial fix shipped in OpenClaw 2026.3.31 on March 31, 2026. The current published npm release 2026.4.1 from April 1, 2026 also contains follow-up hardening for the same surface.

Thanks @nexrin for reporting.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "openclaw"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2026.2.19"
            },
            {
              "fixed": "2026.3.31"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-07T18:14:50Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "## Summary\n\nBefore OpenClaw 2026.3.31, the Zalo webhook replay-dedupe cache was shared across authenticated webhook targets and keyed too broadly. In multi-account deployments, a replay seen on one account could suppress a legitimate event on another account if `event_name` and `message_id` matched.\n\n## Impact\n\nAn attacker who controlled one authenticated Zalo webhook path in a multi-account gateway deployment could cause silent message suppression on a different Zalo account sharing that gateway. This was an availability issue; it did not provide cross-account authentication or data access.\n\n## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Affected versions: `\u003e= 2026.2.19, \u003c 2026.3.31`\n- Patched versions: `\u003e= 2026.3.31`\n- Latest published npm version: `2026.4.1`\n\n## Fix Commit(s)\n\n- `4d038bb242c11f39e45f6a4bde400e5fd42e4ebf` \u2014 scope webhook replay dedupe per target\n- `7cea7c29705b188b464cc9cdc107c275b94b2a72` \u2014 follow-up hardening to scope replay dedupe by path and account\n\n## Release Process Note\n\nThe initial fix shipped in OpenClaw `2026.3.31` on March 31, 2026. The current published npm release `2026.4.1` from April 1, 2026 also contains follow-up hardening for the same surface.\n\nThanks @nexrin for reporting.",
  "id": "GHSA-fqrj-m88p-qf3v",
  "modified": "2026-04-07T18:14:50Z",
  "published": "2026-04-07T18:14:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-fqrj-m88p-qf3v"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/commit/4d038bb242c11f39e45f6a4bde400e5fd42e4ebf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/commit/7cea7c29705b188b464cc9cdc107c275b94b2a72"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openclaw/openclaw"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenClaw: Zalo replay dedupe cache could suppress events across authenticated webhook targets"
}

GHSA-FR3J-67C2-CFFX

Vulnerability from github – Published: 2023-11-10 00:30 – Updated: 2023-11-16 21:30
VLAI
Details

An issue discovered in Pfsense CE version 2.6.0 allows attackers to change the password of any user without verification.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-29975"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-11-09T22:15:10Z",
    "severity": "HIGH"
  },
  "details": "An issue discovered in Pfsense CE version 2.6.0 allows attackers to change the password of any user without verification.",
  "id": "GHSA-fr3j-67c2-cffx",
  "modified": "2023-11-16T21:30:46Z",
  "published": "2023-11-10T00:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-29975"
    },
    {
      "type": "WEB",
      "url": "https://www.esecforte.com/cve-2023-29975-unverified-password-changed"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-FR4G-8PF8-PC9C

Vulnerability from github – Published: 2022-05-13 01:46 – Updated: 2025-04-20 03:36
VLAI
Details

An attacker that has hijacked a Unitrends Enterprise Backup (before 9.1.2) web server session can leverage api/includes/users.php to change the password of the logged in account without knowing the current password. This allows for an account takeover.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2017-7284"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-04-12T22:59:00Z",
    "severity": "HIGH"
  },
  "details": "An attacker that has hijacked a Unitrends Enterprise Backup (before 9.1.2) web server session can leverage api/includes/users.php to change the password of the logged in account without knowing the current password. This allows for an account takeover.",
  "id": "GHSA-fr4g-8pf8-pc9c",
  "modified": "2025-04-20T03:36:00Z",
  "published": "2022-05-13T01:46:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-7284"
    },
    {
      "type": "WEB",
      "url": "https://rhinosecuritylabs.com/research/remote-code-execution-bug-hunting-chapter-1"
    }
  ],
  "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-FR4R-3V2C-WV3M

Vulnerability from github – Published: 2022-05-24 19:12 – Updated: 2022-05-24 19:12
VLAI
Details

A vulnerability found in UniFi Protect application V1.18.1 and earlier permits a malicious actor who has already gained access to a network to subsequently control the Protect camera(s) assigned to said network. This vulnerability is fixed in UniFi Protect application V1.19.0 and later.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2021-22943"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-08-31T17:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "A vulnerability found in UniFi Protect application V1.18.1 and earlier permits a malicious actor who has already gained access to a network to subsequently control the Protect camera(s) assigned to said network. This vulnerability is fixed in UniFi Protect application V1.19.0 and later.",
  "id": "GHSA-fr4r-3v2c-wv3m",
  "modified": "2022-05-24T19:12:35Z",
  "published": "2022-05-24T19:12:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22943"
    },
    {
      "type": "WEB",
      "url": "https://community.ui.com/releases/Security-Advisory-Bulletin-019-019/90a00abe-d6b6-43c6-92d4-0a0342f1506f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Mitigation
Architecture and Design

Strategy: Libraries or Frameworks

Use an authentication framework or library such as the OWASP ESAPI Authentication feature.

CAPEC-114: Authentication Abuse

An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker.

CAPEC-115: Authentication Bypass

An attacker gains access to application, service, or device with the privileges of an authorized or privileged user by evading or circumventing an authentication mechanism. The attacker is therefore able to access protected data without authentication ever having taken place.

CAPEC-151: Identity Spoofing

Identity Spoofing refers to the action of assuming (i.e., taking on) the identity of some other entity (human or non-human) and then using that identity to accomplish a goal. An adversary may craft messages that appear to come from a different principle or use stolen / spoofed authentication credentials.

CAPEC-194: Fake the Source of Data

An adversary takes advantage of improper authentication to provide data or services under a falsified identity. The purpose of using the falsified identity may be to prevent traceability of the provided data or to assume the rights granted to another individual. One of the simplest forms of this attack would be the creation of an email message with a modified "From" field in order to appear that the message was sent from someone other than the actual sender. The root of the attack (in this case the email system) fails to properly authenticate the source and this results in the reader incorrectly performing the instructed action. Results of the attack vary depending on the details of the attack, but common results include privilege escalation, obfuscation of other attacks, and data corruption/manipulation.

CAPEC-22: Exploiting Trust in Client

An attack of this type exploits vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by communicating directly with the server where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.

CAPEC-57: Utilizing REST's Trust in the System Resource to Obtain Sensitive Data

This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to obtain sensitive data once SSL is terminated.

CAPEC-593: Session Hijacking

This type of attack involves an adversary that exploits weaknesses in an application's use of sessions in performing authentication. The adversary is able to steal or manipulate an active session and use it to gain unathorized access to the application.

CAPEC-633: Token Impersonation

An adversary exploits a weakness in authentication to create an access token (or equivalent) that impersonates a different entity, and then associates a process/thread to that that impersonated token. This action causes a downstream user to make a decision or take action that is based on the assumed identity, and not the response that blocks the adversary.

CAPEC-650: Upload a Web Shell to a Web Server

By exploiting insufficient permissions, it is possible to upload a web shell to a web server in such a way that it can be executed remotely. This shell can have various capabilities, thereby acting as a "gateway" to the underlying web server. The shell might execute at the higher permission level of the web server, providing the ability the execute malicious code at elevated levels.

CAPEC-94: Adversary in the Middle (AiTM)

An adversary targets the communication between two components (typically client and server), in order to alter or obtain data from transactions. A general approach entails the adversary placing themself within the communication channel between the two components.