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CVE-2026-61911

Estado: AnalizadaMedia (4.3)—

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired during LMTP delivery.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Cyrus — Imap

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-61911",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-61911",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-10T18:59:21.694757Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "cve@mitre.org",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "cyrusimap",
          "product": "Cyrus IMAP",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "3.8.8",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.9.0",
              "lessThan": "3.10.4",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.11.0",
              "lessThan": "3.12.4",
              "versionType": "semver"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-09-09T20:18:36.800",
  "references": [
    {
      "url": "https://cyrusimap.org",
      "tags": [
        "Product"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html",
      "tags": [
        "Release Notes"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html",
      "tags": [
        "Release Notes"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html",
      "tags": [
        "Release Notes"
      ],
      "source": "cve@mitre.org"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cve@mitre.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-497"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired during LMTP delivery."
    }
  ],
  "lastModified": "2026-09-16T15:23:58.500",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "28C57505-AC73-4870-AF38-C27602313743",
              "versionEndExcluding": "3.8.8"
            },
            {
              "criteria": "cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B34CFCEF-7C23-40E2-8B1C-99574EAEFA83",
              "versionEndExcluding": "3.10.4",
              "versionStartIncluding": "3.9.0"
            },
            {
              "criteria": "cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F48F621D-9615-43D9-9086-7A506473291B",
              "versionEndExcluding": "3.12.4",
              "versionStartIncluding": "3.11.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}