CVE-2025-9823

{
  "id": "CVE-2025-9823",
  "sourceIdentifier": "[email protected]",
  "published": "2025-09-03T15:15:49.247",
  "lastModified": "2026-10-19T17:10:00.173",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "SummaryA Cross-Site Scripting (XSS) vulnerability allows an attacker to execute arbitrary JavaScript in the context of another user’s session. This occurs because user-supplied input is reflected back in the server’s response without proper sanitization or escaping, potentially enabling malicious actions such as session hijacking, credential theft, or unauthorized actions in the application.\n\nDetailsThe vulnerability resides in the “Tags” input field on the /s/ajax?action=lead:addLeadTags endpoint. Although the server applies sanitization before storing the data or returning it later, the payload is executed immediately in the victim’s browser upon reflection, allowing an attacker to run arbitrary JavaScript in the user’s session.\n\nImpactA Reflected XSS attack can have a significant impact, allowing attackers to steal sensitive user data like cookies, redirect users to malicious websites, manipulate the web page content, and essentially take control of a user's session within an application by executing malicious JavaScript code within the victim's browser, even if the server-side code is secure; essentially enabling them to perform actions as if they were the logged-in user.\n\nReferences  *   Web Security Academy: Cross-site scripting https://portswigger.net/web-security/cross-site-scripting \n  *   Web Security Academy: Reflected cross-site scripting https://portswigger.net/web-security/cross-site-scripting/reflected"
    },
    {
      "lang": "es",
      "value": "Resumen\nUna vulnerabilidad de cross-site scripting (XSS) permite a un atacante ejecutar JavaScript arbitrario en el contexto de la sesión de otro usuario. Esto ocurre porque la entrada proporcionada por el usuario se refleja en la respuesta del servidor sin una sanitización o escape adecuados, lo que podría permitir acciones maliciosas como el secuestro de sesión, el robo de credenciales o acciones no autorizadas en la aplicación.\n\nDetalles\nLa vulnerabilidad reside en el campo de entrada 'Tags' en el endpoint /s/ajax?action=lead:addLeadTags. Aunque el servidor aplica sanitización antes de almacenar los datos o devolverlos más tarde, el payload se ejecuta inmediatamente en el navegador de la víctima tras la reflexión, permitiendo a un atacante ejecutar JavaScript arbitrario en la sesión del usuario.\n\nImpacto\nUn ataque de XSS reflejado puede tener un impacto significativo, permitiendo a los atacantes robar datos sensibles del usuario como cookies, redirigir a los usuarios a sitios web maliciosos, manipular el contenido de la página web y esencialmente tomar el control de la sesión de un usuario dentro de una aplicación ejecutando código JavaScript malicioso dentro del navegador de la víctima, incluso si el código del lado del servidor es seguro; esencialmente permitiéndoles realizar acciones como si fueran el usuario autenticado.\n\nReferencias\n  *   Web Security Academy: Cross-site scripting https://portswigger.net/web-security/cross-site-scripting\n  *   Web Security Academy: Reflected cross-site scripting https://portswigger.net/web-security/cross-site-scripting/reflected"
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Mautic",
          "product": "Mautic",
          "defaultStatus": "unaffected",
          "collectionURL": "https://packagist.org",
          "packageName": "mautic/core",
          "repo": "https://github.com/mautic/mautic",
          "versions": [
            {
              "version": ">= 4.4.0",
              "lessThan": "< 4.4.17",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": ">= 5.0.0-alpha",
              "lessThan": "< 5.2.8",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": ">= 6.0.0-alpha",
              "lessThan": "< 6.0.5",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/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",
          "baseScore": 4.8,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "LOW",
          "userInteraction": "ACTIVE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-09-03T17:32:56.733259Z",
          "id": "CVE-2025-9823",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/mautic/mautic/security/advisories/GHSA-9v8p-m85m-f7mm",
      "source": "[email protected]"
    }
  ]
}