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Common Weakness Enumeration

CWE-565

Allowed

Reliance on Cookies without Validation and Integrity Checking

Abstraction: Base · Status: Incomplete

The product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user.

98 vulnerabilities reference this CWE, most recent first.

GHSA-4VWM-CMFJ-FP9Q

Vulnerability from github – Published: 2024-03-30 03:30 – Updated: 2024-11-04 18:31
VLAI
Details

Ruijie RG-NBR700GW 10.3(4b12) router lacks cookie verification when resetting the password, resulting in an administrator password reset vulnerability. An attacker can use this vulnerability to log in to the device and disrupt the business of the enterprise.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-28288"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-03-30T01:15:47Z",
    "severity": "CRITICAL"
  },
  "details": "Ruijie RG-NBR700GW 10.3(4b12) router lacks cookie verification when resetting the password, resulting in an administrator password reset vulnerability. An attacker can use this vulnerability to log in to the device and disrupt the business of the enterprise.",
  "id": "GHSA-4vwm-cmfj-fp9q",
  "modified": "2024-11-04T18:31:17Z",
  "published": "2024-03-30T03:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-28288"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adminquit/CVE-2024-28288/blob/d8223c6d45af877669c27fa0a95adfe51924fa86/CVE-2024-28288/CVE-2024-28288.md"
    },
    {
      "type": "WEB",
      "url": "https://pan.baidu.com/s/1H4J_eA6wSCnDEsUSAWIzsg?pwd=CVE1"
    }
  ],
  "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-55MM-5399-7R63

Vulnerability from github – Published: 2020-08-05 14:52 – Updated: 2021-03-04 18:25
VLAI
Summary
Reliance on Cookies without validation in OctoberCMS
Details

Impact

Previously encrypted cookie values were not tied to the name of the cookie the value belonged to. This meant that certain classes of attacks that took advantage of other theoretical vulnerabilities in user facing code (nothing exploitable in the core project itself) had a higher chance of succeeding.

Specifically, if your usage exposed a way for users to provide unfiltered user input and have it returned to them as an encrypted cookie (ex. storing a user provided search query in a cookie) they could then use the generated cookie in place of other more tightly controlled cookies; or if your usage exposed the plaintext version of an encrypted cookie at any point to the user they could theoretically provide encrypted content from your application back to it as an encrypted cookie and force the framework to decrypt it for them.

Patches

Issue has been patched in Build 468 (v1.0.468).

NOTE: If you are using the cookie session driver, all of your session data will be invalidated. All other session drivers should smoothly upgrade to the changes (although the backend authentication persist cookie will also be invalidated requiring users to login again once their current session expires).

Workarounds

Apply https://github.com/octobercms/library/commit/28310d4fb336a1741b39498f4474497644a6875c to your installation manually if unable to upgrade to Build 468.

References

  • https://blog.laravel.com/laravel-cookie-security-releases
  • https://github.com/laravel/framework/compare/4c7d118181d6c7f1f883643702df807ced016c5e...a731824421f9ebc586728ea9c7cff231a249aaa9

For more information

If you have any questions or comments about this advisory: * Email us at hello@octobercms.com

Threat Assessment

Assessed as Low given that it is not directly exploitable within the core but requires other security vulnerabilities within the application to have an effect and the severity of its effect depends entirely on the severity of those other holes in the application's defences.

Acknowledgements

Thanks to Takashi Terada of Mitsui Bussan Secure Directions, Inc. for finding the original issue in Laravel and @taylorotwell for sharing the report with the October CMS team.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "october/rain"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.319"
            },
            {
              "fixed": "1.0.468"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-15128"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-327",
      "CWE-565"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-07-31T17:44:58Z",
    "nvd_published_at": "2020-07-31T18:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nPreviously encrypted cookie values were not tied to the name of the cookie the value belonged to. This meant that certain classes of attacks that took advantage of other theoretical vulnerabilities in user facing code (nothing exploitable in the core project itself) had a higher chance of succeeding. \n\nSpecifically, if your usage exposed a way for users to provide unfiltered user input and have it returned to them as an encrypted cookie (ex. storing a user provided search query in a cookie) they could then use the generated cookie in place of other more tightly controlled cookies; or if your usage exposed the plaintext version of an encrypted cookie at any point to the user they could theoretically provide encrypted content from your application back to it as an encrypted cookie and force the framework to decrypt it for them. \n\n### Patches\nIssue has been patched in Build 468 (v1.0.468).\n\n\u003e**NOTE**: If you are using the cookie session driver, all of your session data will be invalidated. All other session drivers should smoothly upgrade to the changes (although the backend authentication persist cookie will also be invalidated requiring users to login again once their current session expires).\n\n### Workarounds\nApply https://github.com/octobercms/library/commit/28310d4fb336a1741b39498f4474497644a6875c to your installation manually if unable to upgrade to Build 468.\n\n### References\n- https://blog.laravel.com/laravel-cookie-security-releases\n- https://github.com/laravel/framework/compare/4c7d118181d6c7f1f883643702df807ced016c5e...a731824421f9ebc586728ea9c7cff231a249aaa9\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [hello@octobercms.com](mailto:hello@octobercms.com)\n\n### Threat Assessment\nAssessed as Low given that it is not directly exploitable within the core but requires other security vulnerabilities within the application to have an effect and the severity of its effect depends entirely on the severity of those other holes in the application\u0027s defences.\n\n### Acknowledgements\n\nThanks to [Takashi Terada of Mitsui Bussan Secure Directions, Inc.](https://www.linkedin.com/in/takeshi-terada-b570a6100/) for finding the original issue in Laravel and @taylorotwell for sharing the report with the October CMS team.",
  "id": "GHSA-55mm-5399-7r63",
  "modified": "2021-03-04T18:25:42Z",
  "published": "2020-08-05T14:52:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/octobercms/october/security/advisories/GHSA-55mm-5399-7r63"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-15128"
    },
    {
      "type": "WEB",
      "url": "https://github.com/octobercms/library/pull/508"
    },
    {
      "type": "WEB",
      "url": "https://github.com/octobercms/library/commit/28310d4fb336a1741b39498f4474497644a6875c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Reliance on Cookies without validation in OctoberCMS"
}

GHSA-58QR-V987-VH6W

Vulnerability from github – Published: 2026-03-26 03:30 – Updated: 2026-03-26 15:30
VLAI
Details

Plack::Middleware::Session::Cookie versions through 0.21 for Perl allows remote code execution.

Plack::Middleware::Session::Cookie versions through 0.21 has a security vulnerability where it allows an attacker to execute arbitrary code on the server during deserialization of the cookie data, when there is no secret used to sign the cookie.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2014-125112"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-26T03:16:00Z",
    "severity": "CRITICAL"
  },
  "details": "Plack::Middleware::Session::Cookie versions through 0.21 for Perl allows remote code execution.\n\nPlack::Middleware::Session::Cookie versions through 0.21 has a security vulnerability where it allows an attacker to execute arbitrary code on the server during deserialization of the cookie data, when there is no secret used to sign the cookie.",
  "id": "GHSA-58qr-v987-vh6w",
  "modified": "2026-03-26T15:30:36Z",
  "published": "2026-03-26T03:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2014-125112"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/miyagawa/2b8764af908a0dacd43d"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.23-TRIAL/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/26/2"
    }
  ],
  "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-5J3G-JM9F-QJGV

Vulnerability from github – Published: 2026-01-14 00:31 – Updated: 2026-01-14 00:31
VLAI
Details

WAGO 750-8212 PFC200 G2 2ETH RS firmware contains a privilege escalation vulnerability that allows attackers to manipulate user session cookies. Attackers can modify the cookie's 'name' and 'roles' parameters to elevate from ordinary user to administrative privileges without authentication.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2022-50926"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-13T23:15:56Z",
    "severity": "HIGH"
  },
  "details": "WAGO 750-8212 PFC200 G2 2ETH RS firmware contains a privilege escalation vulnerability that allows attackers to manipulate user session cookies. Attackers can modify the cookie\u0027s \u0027name\u0027 and \u0027roles\u0027 parameters to elevate from ordinary user to administrative privileges without authentication.",
  "id": "GHSA-5j3g-jm9f-qjgv",
  "modified": "2026-01-14T00:31:28Z",
  "published": "2026-01-14T00:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50926"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/50793"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/wago-pfc-g-eth-rs-privilege-escalation"
    },
    {
      "type": "WEB",
      "url": "https://www.wago.com"
    }
  ],
  "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"
    },
    {
      "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/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-5QXH-R3CQ-86G7

Vulnerability from github – Published: 2022-05-13 01:46 – Updated: 2025-04-20 03:34
VLAI
Details

Privilege escalation vulnerability on the DIGISOL DG-HR1400 1.00.02 wireless router enables an attacker to escalate from user privilege to admin privilege just by modifying the Base64-encoded session cookie value.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2017-6896"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-03-14T20:59:00Z",
    "severity": "HIGH"
  },
  "details": "Privilege escalation vulnerability on the DIGISOL DG-HR1400 1.00.02 wireless router enables an attacker to escalate from user privilege to admin privilege just by modifying the Base64-encoded session cookie value.",
  "id": "GHSA-5qxh-r3cq-86g7",
  "modified": "2025-04-20T03:34:03Z",
  "published": "2022-05-13T01:46:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-6896"
    },
    {
      "type": "WEB",
      "url": "https://drive.google.com/file/d/0B6715xUqH18MX29uRlpaSVJ4OTA/view?usp=sharing"
    },
    {
      "type": "WEB",
      "url": "https://packetstormsecurity.com/files/141693/digisol-escalate.txt"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/41633"
    },
    {
      "type": "WEB",
      "url": "https://www.indrajithan.com/DIGISOL_router_previlage_escaltion"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2017/Mar/52"
    }
  ],
  "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-5W5V-4M3M-W7HQ

Vulnerability from github – Published: 2025-10-31 00:30 – Updated: 2025-10-31 00:30
VLAI
Details

In Brave Browser Desktop versions prior to 1.83.10 that have the split view feature enabled, the "Open Link in Split View" context menu item did not respect the SameSite cookie attribute. Therefore SameSite=Strict cookies would be sent on a cross-site navigation using this method.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-48980"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-31T00:15:36Z",
    "severity": "MODERATE"
  },
  "details": "In Brave Browser Desktop versions prior to 1.83.10 that have the split view feature enabled, the \"Open Link in Split View\" context menu item did not respect the SameSite cookie attribute. Therefore SameSite=Strict cookies would be sent on a cross-site navigation using this method.",
  "id": "GHSA-5w5v-4m3m-w7hq",
  "modified": "2025-10-31T00:30:35Z",
  "published": "2025-10-31T00:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-48980"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3253725"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-64VP-Q339-G7H5

Vulnerability from github – Published: 2022-06-10 00:00 – Updated: 2022-06-16 00:00
VLAI
Details

A vulnerability, which was classified as critical, was found in MONyog Ultimate 6.63. This affects an unknown part of the component Cookie Handler. The manipulation of the argument HasServerEdit/IsAdmin leads to privilege escalation. It is possible to initiate the attack remotely.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2016-15002"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-06-09T17:15:00Z",
    "severity": "HIGH"
  },
  "details": "A vulnerability, which was classified as critical, was found in MONyog Ultimate 6.63. This affects an unknown part of the component Cookie Handler. The manipulation of the argument HasServerEdit/IsAdmin leads to privilege escalation. It is possible to initiate the attack remotely.",
  "id": "GHSA-64vp-q339-g7h5",
  "modified": "2022-06-16T00:00:23Z",
  "published": "2022-06-10T00:00:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-15002"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?id.98355"
    },
    {
      "type": "WEB",
      "url": "https://youtu.be/KKlwi-u6wyA"
    }
  ],
  "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"
    }
  ]
}

GHSA-6Q68-2QQ3-8C3H

Vulnerability from github – Published: 2023-06-13 12:30 – Updated: 2026-05-22 09:31
VLAI
Details

Reliance on Cookies without Validation and Integrity Checking in a Security Decision vulnerability in TMT Lockcell allows Privilege Abuse, Authentication Bypass.This issue affects Lockcell: before 15.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-3050"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565",
      "CWE-784"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-06-13T12:15:09Z",
    "severity": "CRITICAL"
  },
  "details": "Reliance on Cookies without Validation and Integrity Checking in a Security Decision vulnerability in TMT Lockcell allows Privilege Abuse, Authentication Bypass.This issue affects Lockcell: before 15.",
  "id": "GHSA-6q68-2qq3-8c3h",
  "modified": "2026-05-22T09:31:27Z",
  "published": "2023-06-13T12:30:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3050"
    },
    {
      "type": "WEB",
      "url": "https://fordefence.com/cve-2023-3050-reliance-on-cookies-without-validation-and-integrity-checking-in-a-security-decision-vulnerability-in-tmt-lockcell-allows-privilege-abuse-authentication-bypass"
    },
    {
      "type": "WEB",
      "url": "https://www.usom.gov.tr/bildirim/tr-23-0345"
    }
  ],
  "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-7G9C-PFQM-8RRR

Vulnerability from github – Published: 2024-10-15 06:30 – Updated: 2024-10-15 06:30
VLAI
Details

The FlowMaster BPM Plus system from NewType has a privilege escalation vulnerability. Remote attackers with regular privileges can elevate their privileges to administrator by tampering with a specific cookie.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-9970"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-15T04:15:04Z",
    "severity": "HIGH"
  },
  "details": "The FlowMaster BPM Plus system from NewType has a privilege escalation vulnerability. Remote attackers with regular privileges can elevate their privileges to administrator by tampering with a specific cookie.",
  "id": "GHSA-7g9c-pfqm-8rrr",
  "modified": "2024-10-15T06:30:31Z",
  "published": "2024-10-15T06:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-9970"
    },
    {
      "type": "WEB",
      "url": "https://www.twcert.org.tw/en/cp-139-8137-ea537-2.html"
    },
    {
      "type": "WEB",
      "url": "https://www.twcert.org.tw/tw/cp-132-8136-4d5b4-1.html"
    }
  ],
  "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"
    }
  ]
}

GHSA-7PHH-J5X4-5979

Vulnerability from github – Published: 2024-04-19 00:30 – Updated: 2024-04-19 00:30
VLAI
Details

The application suffers from a privilege escalation vulnerability. An attacker logged in as guest can escalate his privileges by poisoning the cookie to become administrator.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-22186"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-565"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-18T23:15:07Z",
    "severity": "HIGH"
  },
  "details": "\nThe application suffers from a privilege escalation vulnerability. An \nattacker logged in as guest can escalate his privileges by poisoning the\n cookie to become administrator.\n\n",
  "id": "GHSA-7phh-j5x4-5979",
  "modified": "2024-04-19T00:30:54Z",
  "published": "2024-04-19T00:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-22186"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-24-107-02"
    }
  ],
  "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"
    }
  ]
}

Mitigation
Architecture and Design

Avoid using cookie data for a security-related decision.

Mitigation
Implementation

Perform thorough input validation (i.e.: server side validation) on the cookie data if you're going to use it for a security related decision.

Mitigation
Architecture and Design

Add integrity checks to detect tampering.

Mitigation
Architecture and Design

Protect critical cookies from replay attacks, since cross-site scripting or other attacks may allow attackers to steal a strongly-encrypted cookie that also passes integrity checks. This mitigation applies to cookies that should only be valid during a single transaction or session. By enforcing timeouts, you may limit the scope of an attack. As part of your integrity check, use an unpredictable, server-side value that is not exposed to the client.

CAPEC-226: Session Credential Falsification through Manipulation

An attacker manipulates an existing credential in order to gain access to a target application. Session credentials allow users to identify themselves to a service after an initial authentication without needing to resend the authentication information (usually a username and password) with every message. An attacker may be able to manipulate a credential sniffed from an existing connection in order to gain access to a target server.

CAPEC-31: Accessing/Intercepting/Modifying HTTP Cookies

This attack relies on the use of HTTP Cookies to store credentials, state information and other critical data on client systems. There are several different forms of this attack. The first form of this attack involves accessing HTTP Cookies to mine for potentially sensitive data contained therein. The second form involves intercepting this data as it is transmitted from client to server. This intercepted information is then used by the adversary to impersonate the remote user/session. The third form is when the cookie's content is modified by the adversary before it is sent back to the server. Here the adversary seeks to convince the target server to operate on this falsified information.

CAPEC-39: Manipulating Opaque Client-based Data Tokens

In circumstances where an application holds important data client-side in tokens (cookies, URLs, data files, and so forth) that data can be manipulated. If client or server-side application components reinterpret that data as authentication tokens or data (such as store item pricing or wallet information) then even opaquely manipulating that data may bear fruit for an Attacker. In this pattern an attacker undermines the assumption that client side tokens have been adequately protected from tampering through use of encryption or obfuscation.