CVE-2025-5986

{
  "id": "CVE-2025-5986",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-5986",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-06-11T13:20:09.964885Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Thunderbird",
          "versions": [
            {
              "status": "unaffected",
              "version": "128.11.1",
              "versionType": "rpm",
              "lessThanOrEqual": "128.*"
            },
            {
              "status": "unaffected",
              "version": "139.0.2",
              "versionType": "rpm",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  ],
  "published": "2025-06-11T12:15:29.183",
  "references": [
    {
      "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1958580%2C1968012",
      "tags": [
        "Broken Link"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-49/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-50/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-451"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability was fixed in Thunderbird 128.11.1 and Thunderbird 139.0.2."
    },
    {
      "lang": "es",
      "value": "Un correo electrónico HTML manipulado que utiliza enlaces mailbox:/// puede desencadenar descargas automáticas no solicitadas de archivos .pdf al escritorio o directorio personal del usuario sin previo aviso, incluso con el guardado automático desactivado. Este comportamiento puede utilizarse para llenar el disco con datos innecesarios (p. ej., usando /dev/urandom en Linux) o para filtrar credenciales de Windows mediante enlaces SMB al visualizar el correo electrónico en modo HTML. Si bien se requiere la interacción del usuario para descargar el archivo .pdf, la ofuscación visual puede ocultar el desencadenador de la descarga. Ver el correo electrónico en modo HTML es suficiente para cargar contenido externo. Esta vulnerabilidad afecta a Thunderbird (versión anterior a la 128.11.1) y Thunderbird (versión anterior a la 139.0.2)."
    }
  ],
  "lastModified": "2026-06-17T09:49:09.570",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "02A11E50-4C28-475B-B957-B79BD0654056",
              "versionEndExcluding": "128.11.1"
            },
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "83C7414D-BCC3-4887-88B9-06E2F62FD328",
              "versionEndExcluding": "139.0.2",
              "versionStartIncluding": "135.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@mozilla.org"
}