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    6 vulnerabilities found for Simply Schedule Appointments by Unknown

    CVE-2026-15254 (GCVE-0-2026-15254)

    Vulnerability from nvd – Published: 2026-08-03 06:00 – Updated: 2026-08-03 17:00
    VLAI
    Title
    Simply Schedule Appointments < 1.6.12.11 - Contributor+ Sensitive Data Disclosure via Admin Shortcode
    Summary
    The Simply Schedule Appointments WordPress plugin before 1.6.12.11 does not perform a capability check on an administrative appointment-listing shortcode, and its per-user result scoping fails open for non-staff users, allowing users with the Contributor role and above to disclose all customers' appointment records, including names, email addresses, phone numbers and notes, across the whole site.
    Severity
    6.5 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-03 17:00 UTC
    CWE
    Assigner
    References
    URL Tags
    https://wpscan.com/vulnerability/551554a8-12fb-4e… exploitvdb-entrytechnical-description
    Impacted products
    Vendor Product Version
    Unknown Simply Schedule Appointments Affected: 0 , < 1.6.12.11 (semver)
    		Create a notification for this product.
    Credits
    Meher Sudhakar Abbireddi WPScan
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-15254",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-03T17:00:07.410486Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-863",
                "description": "CWE-863 Incorrect Authorization",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-03T17:00:35.825Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Simply Schedule Appointments",
          "vendor": "Unknown",
          "versions": [
            {
              "lessThan": "1.6.12.11",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Meher Sudhakar Abbireddi"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "WPScan"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Simply Schedule Appointments WordPress plugin before 1.6.12.11 does not perform a capability check on an administrative appointment-listing shortcode, and its per-user result scoping fails open for non-staff users, allowing users with the Contributor role and above to disclose all customers\u0027 appointment records, including names, email addresses, phone numbers and notes, across the whole site."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-863 Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-03T06:00:10.049Z",
        "orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
        "shortName": "WPScan"
      },
      "references": [
        {
          "tags": [
            "exploit",
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://wpscan.com/vulnerability/551554a8-12fb-4eb5-bd24-ae627b58dc3b/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Simply Schedule Appointments \u003c 1.6.12.11 - Contributor+ Sensitive Data Disclosure via Admin Shortcode",
      "x_generator": {
        "engine": "WPScan CVE Generator"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
    "assignerShortName": "WPScan",
    "cveId": "CVE-2026-15254",
    "datePublished": "2026-08-03T06:00:10.049Z",
    "dateReserved": "2026-07-09T12:55:11.383Z",
    "dateUpdated": "2026-08-03T17:00:35.825Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-16540 (GCVE-0-2026-16540)

    Vulnerability from nvd – Published: 2026-08-02 06:00 – Updated: 2026-08-03 17:49
    VLAI
    Title
    Simply Schedule Appointments < 1.6.12.6 - Unauthenticated Appointment Data Disclosure and Mass Deletion via purge Endpoint
    Summary
    The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester's own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-03 17:48 UTC
    CWE
    Assigner
    References
    URL Tags
    https://wpscan.com/vulnerability/c3829294-c388-41… exploitvdb-entrytechnical-description
    Impacted products
    Vendor Product Version
    Unknown Simply Schedule Appointments Affected: 0 , < 1.6.12.6 (semver)
    		Create a notification for this product.
    Credits
    Suleyman Huseynov WPScan
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-16540",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-03T17:48:36.264208Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-863",
                "description": "CWE-863 Incorrect Authorization",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-03T17:49:00.837Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Simply Schedule Appointments",
          "vendor": "Unknown",
          "versions": [
            {
              "lessThan": "1.6.12.6",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Suleyman Huseynov"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "WPScan"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester\u0027s own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-863 Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-02T06:00:13.123Z",
        "orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
        "shortName": "WPScan"
      },
      "references": [
        {
          "tags": [
            "exploit",
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://wpscan.com/vulnerability/c3829294-c388-4151-9e25-a3eac7b1f1c6/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Simply Schedule Appointments \u003c 1.6.12.6 - Unauthenticated Appointment Data Disclosure and Mass Deletion via purge Endpoint",
      "x_generator": {
        "engine": "WPScan CVE Generator"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
    "assignerShortName": "WPScan",
    "cveId": "CVE-2026-16540",
    "datePublished": "2026-08-02T06:00:13.123Z",
    "dateReserved": "2026-07-22T09:38:49.604Z",
    "dateUpdated": "2026-08-03T17:49:00.837Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-13400 (GCVE-0-2026-13400)

    Vulnerability from nvd – Published: 2026-07-27 06:00 – Updated: 2026-07-27 13:53
    VLAI
    Title
    Simply Schedule Appointments < 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information
    Summary
    Simply Schedule Appointments is vulnerable to unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.12.2. The root cause is a sanitization-ordering defect: the rendered notification content is decoded back into live HTML after it has already passed through the Simply Schedule Appointments WordPress plugin before 1.6.12.4's wp_kses_post() filter, so a double-encoded payload survives intake and is reintroduced as an executable element at render time.
    Severity
    6.1 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-07-27 13:53 UTC
    CWE
    Assigner
    References
    URL Tags
    https://wpscan.com/vulnerability/501b2929-3216-45… exploitvdb-entrytechnical-description
    Impacted products
    Vendor Product Version
    Unknown Simply Schedule Appointments Affected: 0 , < 1.6.12.4 (semver)
    		Create a notification for this product.
    Credits
    Revanth Hari Narayana Matte WPScan
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.1,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "CHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-13400",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-27T13:53:08.821347Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-79",
                "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-27T13:53:58.533Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Simply Schedule Appointments",
          "vendor": "Unknown",
          "versions": [
            {
              "lessThan": "1.6.12.4",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Revanth Hari Narayana Matte"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "WPScan"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Simply Schedule Appointments is vulnerable to unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.12.2. The root cause is a sanitization-ordering defect: the rendered notification content is decoded back into live HTML after it has already passed through the Simply Schedule Appointments WordPress plugin before 1.6.12.4\u0027s wp_kses_post() filter, so a double-encoded payload survives intake and is reintroduced as an executable element at render time."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-79 Cross-Site Scripting (XSS)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-27T06:00:03.496Z",
        "orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
        "shortName": "WPScan"
      },
      "references": [
        {
          "tags": [
            "exploit",
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://wpscan.com/vulnerability/501b2929-3216-4587-8124-088fd51becf1/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Simply Schedule Appointments \u003c 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information",
      "x_generator": {
        "engine": "WPScan CVE Generator"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
    "assignerShortName": "WPScan",
    "cveId": "CVE-2026-13400",
    "datePublished": "2026-07-27T06:00:03.496Z",
    "dateReserved": "2026-06-26T08:35:42.471Z",
    "dateUpdated": "2026-07-27T13:53:58.533Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-15254 (GCVE-0-2026-15254)

    Vulnerability from cvelistv5 – Published: 2026-08-03 06:00 – Updated: 2026-08-03 17:00
    VLAI
    Title
    Simply Schedule Appointments < 1.6.12.11 - Contributor+ Sensitive Data Disclosure via Admin Shortcode
    Summary
    The Simply Schedule Appointments WordPress plugin before 1.6.12.11 does not perform a capability check on an administrative appointment-listing shortcode, and its per-user result scoping fails open for non-staff users, allowing users with the Contributor role and above to disclose all customers' appointment records, including names, email addresses, phone numbers and notes, across the whole site.
    Severity
    6.5 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-03 17:00 UTC
    CWE
    Assigner
    References
    URL Tags
    https://wpscan.com/vulnerability/551554a8-12fb-4e… exploitvdb-entrytechnical-description
    Impacted products
    Vendor Product Version
    Unknown Simply Schedule Appointments Affected: 0 , < 1.6.12.11 (semver)
    		Create a notification for this product.
    Credits
    Meher Sudhakar Abbireddi WPScan
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-15254",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-03T17:00:07.410486Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-863",
                "description": "CWE-863 Incorrect Authorization",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-03T17:00:35.825Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Simply Schedule Appointments",
          "vendor": "Unknown",
          "versions": [
            {
              "lessThan": "1.6.12.11",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Meher Sudhakar Abbireddi"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "WPScan"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Simply Schedule Appointments WordPress plugin before 1.6.12.11 does not perform a capability check on an administrative appointment-listing shortcode, and its per-user result scoping fails open for non-staff users, allowing users with the Contributor role and above to disclose all customers\u0027 appointment records, including names, email addresses, phone numbers and notes, across the whole site."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-863 Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-03T06:00:10.049Z",
        "orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
        "shortName": "WPScan"
      },
      "references": [
        {
          "tags": [
            "exploit",
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://wpscan.com/vulnerability/551554a8-12fb-4eb5-bd24-ae627b58dc3b/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Simply Schedule Appointments \u003c 1.6.12.11 - Contributor+ Sensitive Data Disclosure via Admin Shortcode",
      "x_generator": {
        "engine": "WPScan CVE Generator"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
    "assignerShortName": "WPScan",
    "cveId": "CVE-2026-15254",
    "datePublished": "2026-08-03T06:00:10.049Z",
    "dateReserved": "2026-07-09T12:55:11.383Z",
    "dateUpdated": "2026-08-03T17:00:35.825Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-16540 (GCVE-0-2026-16540)

    Vulnerability from cvelistv5 – Published: 2026-08-02 06:00 – Updated: 2026-08-03 17:49
    VLAI
    Title
    Simply Schedule Appointments < 1.6.12.6 - Unauthenticated Appointment Data Disclosure and Mass Deletion via purge Endpoint
    Summary
    The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester's own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-03 17:48 UTC
    CWE
    Assigner
    References
    URL Tags
    https://wpscan.com/vulnerability/c3829294-c388-41… exploitvdb-entrytechnical-description
    Impacted products
    Vendor Product Version
    Unknown Simply Schedule Appointments Affected: 0 , < 1.6.12.6 (semver)
    		Create a notification for this product.
    Credits
    Suleyman Huseynov WPScan
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
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              "confidentialityImpact": "HIGH",
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              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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          "vendor": "Unknown",
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      ],
      "credits": [
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          "type": "finder",
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          "type": "coordinator",
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      ],
      "descriptions": [
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          "value": "The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester\u0027s own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them."
        }
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      "problemTypes": [
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              "description": "CWE-863 Incorrect Authorization",
              "lang": "en",
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      "providerMetadata": {
        "dateUpdated": "2026-08-02T06:00:13.123Z",
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      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Simply Schedule Appointments \u003c 1.6.12.6 - Unauthenticated Appointment Data Disclosure and Mass Deletion via purge Endpoint",
      "x_generator": {
        "engine": "WPScan CVE Generator"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
    "assignerShortName": "WPScan",
    "cveId": "CVE-2026-16540",
    "datePublished": "2026-08-02T06:00:13.123Z",
    "dateReserved": "2026-07-22T09:38:49.604Z",
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    "state": "PUBLISHED"
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    CVE-2026-13400 (GCVE-0-2026-13400)

    Vulnerability from cvelistv5 – Published: 2026-07-27 06:00 – Updated: 2026-07-27 13:53
    VLAI
    Title
    Simply Schedule Appointments < 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information
    Summary
    Simply Schedule Appointments is vulnerable to unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.12.2. The root cause is a sanitization-ordering defect: the rendered notification content is decoded back into live HTML after it has already passed through the Simply Schedule Appointments WordPress plugin before 1.6.12.4's wp_kses_post() filter, so a double-encoded payload survives intake and is reintroduced as an executable element at render time.
    Severity
    6.1 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-07-27 13:53 UTC
    CWE
    Assigner
    References
    URL Tags
    https://wpscan.com/vulnerability/501b2929-3216-45… exploitvdb-entrytechnical-description
    Impacted products
    Vendor Product Version
    Unknown Simply Schedule Appointments Affected: 0 , < 1.6.12.4 (semver)
    		Create a notification for this product.
    Credits
    Revanth Hari Narayana Matte WPScan
    Show details on NVD website
    To clipboard 

    {
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    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 6.1,
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              "confidentialityImpact": "LOW",
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              "scope": "CHANGED",
              "userInteraction": "REQUIRED",
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                "id": "CVE-2026-13400",
                "options": [
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              },
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            "descriptions": [
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                "cweId": "CWE-79",
                "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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                "type": "CWE"
              }
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        "providerMetadata": {
          "dateUpdated": "2026-07-27T13:53:58.533Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Simply Schedule Appointments",
          "vendor": "Unknown",
          "versions": [
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              "status": "affected",
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              "versionType": "semver"
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        {
          "lang": "en",
          "type": "finder",
          "value": "Revanth Hari Narayana Matte"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "WPScan"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Simply Schedule Appointments is vulnerable to unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.12.2. The root cause is a sanitization-ordering defect: the rendered notification content is decoded back into live HTML after it has already passed through the Simply Schedule Appointments WordPress plugin before 1.6.12.4\u0027s wp_kses_post() filter, so a double-encoded payload survives intake and is reintroduced as an executable element at render time."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-79 Cross-Site Scripting (XSS)",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
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        "orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
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      },
      "title": "Simply Schedule Appointments \u003c 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information",
      "x_generator": {
        "engine": "WPScan CVE Generator"
      }
    }
  },
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