{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-61909", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-09-09T19:50:09.056Z", "dateReserved": "2026-07-13T00:00:00.000Z", "datePublished": "2026-09-09T00:00:00.000Z"}, "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"}]}], "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.5, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-420", "description": "CWE-420 Unprotected Alternate Channel", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-09-09T19:50:09.056Z"}, "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"}, "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.8.8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9.0", "versionEndExcluding": "3.10.4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11.0", "versionEndExcluding": "3.12.4"}]}]}]}}, "dataVersion": "5.2"}

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{"affected": [{"affectedData": [{"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"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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", "lastModified": "2026-09-09T20:22:32.663", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.5, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 1.4, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-09-09T20:18:36.523", "references": [{"source": "cve@mitre.org", "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"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-420"}], "source": "cve@mitre.org", "type": "Primary"}]}

{"bugzilla": {"description": "cyrus-imapd: cyrus-imapd: CalDAV/CardDAV multiget bypasses per-href ACL", "id": "2526308", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526308"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-420", "details": ["A flaw was found in cyrus-imapd. An authenticated DAV (Distributed Authoring and Versioning) user with some shared access to another user's calendar or address book could read unshared events or contacts. This information disclosure occurs by including specific resource identifiers in a calendar-multiget or addressbook-multiget REPORT, bypassing intended access controls."], "mitigation": {"lang": "en:us", "value": "To reduce the attack surface, restrict network access to the cyrus-imapd service to trusted internal networks or localhost. This operational control can be implemented by configuring network firewalls to limit inbound connections to the service's listening port. This may impact legitimate users who require remote CalDAV/CardDAV access."}, "name": "CVE-2026-61909", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-10T07:42:41Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-61909\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-61909"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,3.8.8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.9.0,3.10.4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.11.0,3.12.4)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Cyrus IMAP", "source": "cna", "vendor": "cyrusimap"}, "product": "cyrus_imap", "vendor": "cyrusimap"}], "created": "2026-09-09T22:15:17.107932+00:00", "title": "CalDAV/CardDAV Multiget ACL Bypass in Cyrus IMAP", "updated": "2026-09-10T13:30:12.291162+00:00", "vendors": ["cyrusimap", "cyrusimap$PRODUCT$cyrus_imap"]}