Common Weakness Enumeration

CWE-295

Allowed

Improper Certificate Validation

Abstraction: Base · Status: Draft

The product does not validate, or incorrectly validates, a certificate.

1917 vulnerabilities reference this CWE, most recent first.

GHSA-95FC-G4GJ-MQMX

Vulnerability from github – Published: 2025-04-25 15:12 – Updated: 2025-05-05 22:02
VLAI
Summary
Steve doesn’t verify a server’s certificate and is susceptible to man-in-the-middle (MitM) attacks
Details

Impact

A vulnerability has been identified in Steve where by default it was using an insecure option that did not validate the certificate presented by the remote server while performing a TLS connection. This could allow the execution of a man-in-the-middle (MitM) attack against services using Steve.

For example, Rancher relies on Steve as a dependency for its user interface (UI) to proxy requests to Kubernetes clusters. Users who have the permission to create a service in Rancher’s local cluster can take over Rancher’s UI and display their own UI to gather sensitive information. This is only possible when the setting ui-offline-preferred is manually set to remote (by default Rancher sets it to dynamic). This enables further attacks such as cross-site scripting (XSS), or tampering the UI to collect passwords from other users etc.

Please consult the associated MITRE ATT&CK - Technique - Adversary-in-the-Middle for further information about this category of attack.

Patches

Patched versions of Steve include releases v0.2.1, v0.3.3, v0.4.4 and v0.5.13.

This vulnerability is addressed by changing Steve to always verify a server’s certificate based on Go’s TLS settings.

Workarounds

If you can't upgrade to a fixed version, please make sure that you are only using Steve to connect to trusted servers.

References

If you have any questions or comments about this advisory: - Reach out to the SUSE Rancher Security team for security related inquiries. - Open an issue in the Rancher repository. - Verify with our support matrix and product support lifecycle.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/steve"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.2.0"
            },
            {
              "fixed": "0.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/steve"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.3.0"
            },
            {
              "fixed": "0.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/steve"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.4.0"
            },
            {
              "fixed": "0.4.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/steve"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.5.0"
            },
            {
              "fixed": "0.5.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-32198"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-04-25T15:12:44Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nA vulnerability has been identified in Steve where by default it was using an insecure option that did not validate the certificate presented by the remote server while performing a TLS connection. This could allow the execution of a man-in-the-middle (MitM) attack against services using Steve.\n\nFor example, Rancher relies on Steve as a dependency for its user interface (UI) to proxy requests to Kubernetes clusters. Users who have the permission to create a service in Rancher\u2019s local cluster can take over Rancher\u2019s UI and display their own UI to gather sensitive information. This is only possible when the setting `ui-offline-preferred` is manually set to `remote` (by default Rancher sets it to `dynamic`). This enables further attacks such as cross-site scripting (XSS), or tampering the UI to collect passwords from other users etc.\n\nPlease consult the associated  [MITRE ATT\u0026CK - Technique - Adversary-in-the-Middle](https://attack.mitre.org/techniques/T1557/) for further information about this category of attack.\n\n### Patches\nPatched versions of Steve include releases `v0.2.1`, `v0.3.3`, `v0.4.4` and `v0.5.13`.\n\nThis vulnerability is addressed by changing Steve to always verify a server\u2019s certificate based on Go\u2019s TLS settings.\n\n### Workarounds\nIf you can\u0027t upgrade to a fixed version, please make sure that you are only using Steve to connect to trusted servers.\n\n### References\nIf you have any questions or comments about this advisory:\n- Reach out to the [SUSE Rancher Security team](https://github.com/rancher/rancher/security/policy) for security related inquiries.\n- Open an issue in the [Rancher](https://github.com/rancher/rancher/issues/new/choose) repository.\n- Verify with our [support matrix](https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/) and [product support lifecycle](https://www.suse.com/lifecycle/).",
  "id": "GHSA-95fc-g4gj-mqmx",
  "modified": "2025-05-05T22:02:01Z",
  "published": "2025-04-25T15:12:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rancher/steve/security/advisories/GHSA-95fc-g4gj-mqmx"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rancher/steve"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2025-3648"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Steve doesn\u2019t verify a server\u2019s certificate and is susceptible to man-in-the-middle (MitM) attacks"
}

GHSA-965H-392X-2MH5

Vulnerability from github – Published: 2026-04-16 21:16 – Updated: 2026-04-16 21:16
VLAI
Summary
webpki: Name constraints for URI names were incorrectly accepted
Details

Name constraints for URI names were ignored and therefore accepted.

Note this library does not provide an API for asserting URI names, and URI name constraints are otherwise not implemented. URI name constraints are now rejected unconditionally.

Since name constraints are restrictions on otherwise properly-issued certificates, this bug is reachable only after signature verification and requires misissuance to exploit.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "rustls-webpki"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.101.0"
            },
            {
              "fixed": "0.103.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "rustls-webpki"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.104.0-alpha.1"
            },
            {
              "fixed": "0.104.0-alpha.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T21:16:22Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "Name constraints for URI names were ignored and therefore accepted.\n\nNote this library does not provide an API for asserting URI names, and URI name constraints are otherwise not implemented.  URI name constraints are now rejected unconditionally.\n\nSince name constraints are restrictions on otherwise properly-issued certificates, this bug is reachable only after signature verification and requires misissuance to exploit.",
  "id": "GHSA-965h-392x-2mh5",
  "modified": "2026-04-16T21:16:23Z",
  "published": "2026-04-16T21:16:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rustls/webpki/security/advisories/GHSA-965h-392x-2mh5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rustls/webpki"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0098.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "webpki: Name constraints for URI names were incorrectly accepted"
}

GHSA-972M-28WJ-HR23

Vulnerability from github – Published: 2022-05-17 02:48 – Updated: 2025-04-20 03:36
VLAI
Details

DMMFX Trade for Android 1.5.0 and earlier, DMMFX DEMO Trade for Android 1.5.0 and earlier, and GAITAMEJAPAN FX Trade for Android 1.4.0 and earlier do not verify SSL certificates.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2016-4818"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-04-20T18:59:00Z",
    "severity": "MODERATE"
  },
  "details": "DMMFX Trade for Android 1.5.0 and earlier, DMMFX DEMO Trade for Android 1.5.0 and earlier, and GAITAMEJAPAN FX Trade for Android 1.4.0 and earlier do not verify SSL certificates.",
  "id": "GHSA-972m-28wj-hr23",
  "modified": "2025-04-20T03:36:21Z",
  "published": "2022-05-17T02:48:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-4818"
    },
    {
      "type": "WEB",
      "url": "https://jvn.jp/en/jp/JVN40898764/995849/index.html"
    },
    {
      "type": "WEB",
      "url": "http://fx.dmm.com/information/press/2016/2016053001"
    },
    {
      "type": "WEB",
      "url": "http://jvn.jp/en/jp/JVN40898764/index.html"
    },
    {
      "type": "WEB",
      "url": "http://jvndb.jvn.jp/en/contents/2016/JVNDB-2016-000092.html"
    },
    {
      "type": "WEB",
      "url": "http://www.gaitamejapan.com/support/news/2016/2016053001"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9749-RQRJ-VCQJ

Vulnerability from github – Published: 2023-01-06 06:30 – Updated: 2025-04-09 21:30
VLAI
Details

Information disclosure due to an insecure hostname validation in the RYDE application 5.8.43 for Android and iOS allows attackers to take over an account via a deep link.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2022-42979"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-01-06T04:15:00Z",
    "severity": "HIGH"
  },
  "details": "Information disclosure due to an insecure hostname validation in the RYDE application 5.8.43 for Android and iOS allows attackers to take over an account via a deep link.",
  "id": "GHSA-9749-rqrj-vcqj",
  "modified": "2025-04-09T21:30:34Z",
  "published": "2023-01-06T06:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-42979"
    },
    {
      "type": "WEB",
      "url": "https://medium.com/%40jalee0606/how-i-found-my-first-one-click-account-takeover-via-deeplink-in-ryde-5406010c36d8"
    },
    {
      "type": "WEB",
      "url": "https://medium.com/@jalee0606/how-i-found-my-first-one-click-account-takeover-via-deeplink-in-ryde-5406010c36d8"
    }
  ],
  "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-97Q9-GVP5-5XP7

Vulnerability from github – Published: 2025-05-20 18:30 – Updated: 2025-05-20 18:30
VLAI
Details

IBM Security ReaQta EDR 3.12 could allow an attacker to perform unauthorized actions due to improper SSL certificate validation.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-45641"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-20T16:15:25Z",
    "severity": "MODERATE"
  },
  "details": "IBM Security ReaQta EDR 3.12 could allow an attacker to perform unauthorized actions due to improper SSL certificate validation.",
  "id": "GHSA-97q9-gvp5-5xp7",
  "modified": "2025-05-20T18:30:54Z",
  "published": "2025-05-20T18:30:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45641"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7233972"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-97VP-R5M3-J8HV

Vulnerability from github – Published: 2023-07-06 21:14 – Updated: 2024-04-04 05:39
VLAI
Details

An improper certificate validation vulnerability exists in the BIG-IP Edge Client for Windows and macOS and may allow an attacker to impersonate a BIG-IP APM system.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-24461"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-05-03T15:15:12Z",
    "severity": "MODERATE"
  },
  "details": "\nAn improper certificate validation\u00a0vulnerability exists in the BIG-IP Edge Client for Windows and macOS and may allow an attacker to impersonate a BIG-IP APM system.\u00a0 Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
  "id": "GHSA-97vp-r5m3-j8hv",
  "modified": "2024-04-04T05:39:11Z",
  "published": "2023-07-06T21:14:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-24461"
    },
    {
      "type": "WEB",
      "url": "https://my.f5.com/manage/s/article/K000132539"
    }
  ],
  "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:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-9857-WWHP-87GW

Vulnerability from github – Published: 2022-05-24 16:55 – Updated: 2024-04-04 01:54
VLAI
Details

An issue was discovered in Couchbase Server 5.0.0. When creating a new remote cluster reference in Couchbase for XDCR, an invalid certificate is accepted. (The correct behavior is to validate the certificate against the remote cluster.)

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2019-11497"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-09-10T18:15:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in Couchbase Server 5.0.0. When creating a new remote cluster reference in Couchbase for XDCR, an invalid certificate is accepted. (The correct behavior is to validate the certificate against the remote cluster.)",
  "id": "GHSA-9857-wwhp-87gw",
  "modified": "2024-04-04T01:54:56Z",
  "published": "2022-05-24T16:55:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-11497"
    },
    {
      "type": "WEB",
      "url": "https://www.couchbase.com/resources/security#SecurityAlerts"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-987J-V8C2-2P35

Vulnerability from github – Published: 2023-09-03 18:30 – Updated: 2024-04-04 07:22
VLAI
Details

Incorrect certificate validation in InvokeHTTP on Apache NiFi MiNiFi C++ versions 0.13 to 0.14 allows an intermediary to present a forged certificate during TLS handshake negotation. The Disable Peer Verification property of InvokeHTTP was effectively flipped, disabling verification by default, when using HTTPS.

Mitigation: Set the Disable Peer Verification property of InvokeHTTP to true when using MiNiFi C++ versions 0.13.0 or 0.14.0. Upgrading to MiNiFi C++ 0.15.0 corrects the default behavior.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-41180"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-09-03T16:15:10Z",
    "severity": "MODERATE"
  },
  "details": "Incorrect certificate validation in InvokeHTTP on Apache NiFi MiNiFi C++ versions 0.13 to 0.14 allows an intermediary to present a forged certificate during TLS handshake negotation. The Disable Peer Verification property of InvokeHTTP was effectively flipped,  disabling verification by default, when using HTTPS.\n\nMitigation: Set the Disable Peer Verification property of InvokeHTTP to true when using MiNiFi C++ versions 0.13.0 or 0.14.0. Upgrading to MiNiFi C++ 0.15.0 corrects the default behavior.\n\n",
  "id": "GHSA-987j-v8c2-2p35",
  "modified": "2024-04-04T07:22:53Z",
  "published": "2023-09-03T18:30:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-41180"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/b51f8csysg1pvgs6xjjrq5hrjrvfot1y"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-98V4-MV97-2F2X

Vulnerability from github – Published: 2026-06-16 00:34 – Updated: 2026-06-16 00:34
VLAI
Details

Improper validation of SSH host keys in Canon EOS Network Setting Tool Version 1.5.0 or earlier

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-9258"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-16T00:16:35Z",
    "severity": "HIGH"
  },
  "details": "Improper validation of SSH host keys in Canon EOS Network Setting Tool Version 1.5.0 or earlier",
  "id": "GHSA-98v4-mv97-2f2x",
  "modified": "2026-06-16T00:34:24Z",
  "published": "2026-06-16T00:34:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9258"
    },
    {
      "type": "WEB",
      "url": "https://canon.jp/support/support-info/260615vulnerability-response"
    },
    {
      "type": "WEB",
      "url": "https://psirt.canon/advisory-information/cp2026-005"
    },
    {
      "type": "WEB",
      "url": "https://www.canon-europe.com/support/product-security"
    },
    {
      "type": "WEB",
      "url": "https://www.usa.canon.com/about-us/to-our-customers/cpa2026-005-vulnerability-remediation-for-eos-network-setting-tool"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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-98VX-JQRX-7MQ2

Vulnerability from github – Published: 2022-05-24 17:19 – Updated: 2022-05-24 17:19
VLAI
Details

TLS session reuse can lead to host certificate verification bypass in node version < 12.18.0 and < 14.4.0.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2020-8172"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-06-08T14:15:00Z",
    "severity": "MODERATE"
  },
  "details": "TLS session reuse can lead to host certificate verification bypass in node version \u003c 12.18.0 and \u003c 14.4.0.",
  "id": "GHSA-98vx-jqrx-7mq2",
  "modified": "2022-05-24T17:19:34Z",
  "published": "2022-05-24T17:19:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8172"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/811502"
    },
    {
      "type": "WEB",
      "url": "https://nodejs.org/en/blog/vulnerability/june-2020-security-releases"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202101-07"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20200625-0002"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujan2021.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujul2020.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
    }
  ],
  "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:N",
      "type": "CVSS_V3"
    }
  ]
}

Mitigation
Architecture and Design Implementation

Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.

Mitigation
Implementation

If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.

CAPEC-459: Creating a Rogue Certification Authority Certificate

An adversary exploits a weakness resulting from using a hashing algorithm with weak collision resistance to generate certificate signing requests (CSR) that contain collision blocks in their "to be signed" parts. The adversary submits one CSR to be signed by a trusted certificate authority then uses the signed blob to make a second certificate appear signed by said certificate authority. Due to the hash collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the adversary's second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority.

CAPEC-475: Signature Spoofing by Improper Validation

An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.