CVE-2026-75872

{
  "id": "CVE-2026-75872",
  "sourceIdentifier": "4daa8cea-433a-44bd-9456-53b127fc289a",
  "published": "2026-08-18T15:17:15.150",
  "lastModified": "2026-10-22T22:10:00.250",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email."
    },
    {
      "lang": "es",
      "value": "Inyección HTML en el formulario de suscripción público en maalfer MailerUp anterior a 1.1.3 permite a atacantes remotos no autenticados que la aplicación envíe un mensaje que contenga HTML arbitrario, a una dirección elegida por el atacante y desde la identidad de envío configurada del propietario del formulario, a través del campo first_name de la solicitud de suscripción, que se interpola sin escapar en el correo electrónico de verificación de doble opt-in."
    }
  ],
  "affected": [
    {
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a",
      "affectedData": [
        {
          "vendor": "maalfer",
          "product": "MailerUp",
          "defaultStatus": "unaffected",
          "modules": [
            "Public subscription form"
          ],
          "programFiles": [
            "backend/apps/forms/views.py"
          ],
          "repo": "https://github.com/maalfer/mailerup",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.1.3",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "4daa8cea-433a-44bd-9456-53b127fc289a",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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": 6.9,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "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": "2026-08-18T16:04:23.484003Z",
          "id": "CVE-2026-75872",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-80"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/maalfer/mailerup/commit/da4aedc9621911df4ce0cc8f0b321dd6d10f40a5",
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a"
    },
    {
      "url": "https://github.com/maalfer/mailerup/releases/tag/v1.1.3",
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a"
    },
    {
      "url": "https://secur0.com/en/cna/cve-list/cve-2026-75872-html-injection-in-mailerup-double-optin-verification-email",
      "source": "4daa8cea-433a-44bd-9456-53b127fc289a"
    }
  ]
}