{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.8.8"
              },
              {
                "introduced": "3.9.0"
              },
              {
                "fixed": "3.10.4"
              },
              {
                "introduced": "3.11.0"
              },
              {
                "fixed": "3.12.4"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "08031fd42e027bdb5bc286e428a03e1c53c2e105"
            },
            {
              "fixed": "ad6d4e67d0edbdf99e7ce31658c67640f30479c4"
            },
            {
              "fixed": "f8ffbe4a87455c591fe355b03a2713a50f8441ab"
            }
          ],
          "repo": "https://github.com/cyrusimap/cyrus-imapd",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mitre",
    "cwe_ids": [
      "CWE-420"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61909.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "3.8.8"
          },
          {
            "introduced": "3.9.0"
          },
          {
            "fixed": "3.10.4"
          },
          {
            "introduced": "3.11.0"
          },
          {
            "fixed": "3.12.4"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "3.8.8"
          },
          {
            "introduced": "3.9.0"
          },
          {
            "fixed": "3.10.4"
          },
          {
            "introduced": "3.11.0"
          },
          {
            "fixed": "3.12.4"
          }
        ],
        "source": "CPE_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "3.12.4"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or addressbook-multiget REPORT.",
  "id": "CVE-2026-61909",
  "modified": "2026-09-18T03:30:36.176135787Z",
  "published": "2026-09-09T00:00:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cyrusimap.org"
    },
    {
      "type": "WEB",
      "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html"
    },
    {
      "type": "WEB",
      "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html"
    },
    {
      "type": "WEB",
      "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61909.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61909"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}