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CVE-2026-61907 (GCVE-0-2026-61907)

Vulnerability from cvelistv5 – Published: 2026-09-09 00:00 – Updated: 2026-09-09 19:02
VLAI
Summary
An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user's snoozed mailbox could cause insertion of mail to that user's inbox, or any other of their mailboxes whose id was known to the user, despite having no insert permissions to the target mailbox.
Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version CPE status
cyrusimap Cyrus IMAP Affected: 0 , < 3.8.8 (semver)
Affected: 3.9.0 , < 3.10.4 (semver)
Affected: 3.11.0 , < 3.12.4 (semver)
    cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*
    cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*
    cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Cyrus IMAP",
          "vendor": "cyrusimap",
          "versions": [
            {
              "lessThan": "3.8.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.10.4",
              "status": "affected",
              "version": "3.9.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.12.4",
              "status": "affected",
              "version": "3.11.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.8.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.10.4",
                  "versionStartIncluding": "3.9.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.12.4",
                  "versionStartIncluding": "3.11.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user\u0027s snoozed mailbox could cause insertion of mail to that user\u0027s inbox, or any other of their mailboxes whose id was known to the user, despite having no insert permissions to the target mailbox."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863 Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-09T19:02:00.754Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://cyrusimap.org"
        },
        {
          "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html"
        },
        {
          "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html"
        },
        {
          "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html"
        }
      ],
      "x_generator": {
        "engine": "enrichogram 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-61907",
    "datePublished": "2026-09-09T00:00:00.000Z",
    "dateReserved": "2026-07-13T00:00:00.000Z",
    "dateUpdated": "2026-09-09T19:02:00.754Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-61907",
      "date": "2026-09-11",
      "epss": "0.0035",
      "percentile": "0.28204"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-61907\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2026-09-09T19:17:28.927\",\"lastModified\":\"2026-09-09T20:11:44.187\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user\u0027s snoozed mailbox could cause insertion of mail to that user\u0027s inbox, or any other of their mailboxes whose id was known to the user, despite having no insert permissions to the target mailbox.\"}],\"affected\":[{\"source\":\"cve@mitre.org\",\"affectedData\":[{\"vendor\":\"cyrusimap\",\"product\":\"Cyrus IMAP\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"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\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve@mitre.org\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N\",\"baseScore\":4.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":1.4}]},\"weaknesses\":[{\"source\":\"cve@mitre.org\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-863\"}]}],\"references\":[{\"url\":\"https://cyrusimap.org\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html\",\"source\":\"cve@mitre.org\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-10T08:00:29+00:00",
      "cve": "CVE-2026-61907",
      "id": "CVE-2026-61907",
      "initial_release_date": "2026-09-09T08:02:56.654000+00:00",
      "product_status:known_affected": "20",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "cyrus-imapd: cyrus-imapd: JMAP snooze bypasses destination-mailbox ACL",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61907.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.