{"id":"CVE-2026-61909","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.","modified":"2026-09-18T03:48:31.334100825Z","published":"2026-09-09T00:00:00Z","database_specific":{"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"}],"cna_assigner":"mitre"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cyrusimap/cyrus-imapd","events":[{"introduced":"0"},{"fixed":"08031fd42e027bdb5bc286e428a03e1c53c2e105"},{"fixed":"ad6d4e67d0edbdf99e7ce31658c67640f30479c4"},{"fixed":"f8ffbe4a87455c591fe355b03a2713a50f8441ab"}],"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"}}],"versions":["cyrus-imapd-3.8.7","cyrus-imapd-3.10.3","cyrus-imapd-3.12.3","cyrus-imapd-3.12.2","cyrus-imapd-3.8.6","cyrus-imapd-3.10.2","cyrus-imapd-3.12.1","cyrus-imapd-3.12.0","cyrus-imapd-3.12.0-rc1","cyrus-imapd-3.12.0-beta2","cyrus-imapd-3.8.5","cyrus-imapd-3.12.0-beta1","cyrus-imapd-3.10.1","cyrus-imapd-3.12.0-alpha0","cyrus-imapd-3.10.0","cyrus-imapd-3.8.4","cyrus-imapd-3.10.0-rc2","cyrus-imapd-3.8.3","cyrus-imapd-3.10.0-rc1","cyrus-imapd-3.8.2","cyrus-imapd-3.10.0-beta2","cyrus-imapd-3.10.0-beta1","cyrus-imapd-3.11.0-alpha0","cyrus-imapd-3.10.0-alpha0","cyrus-imapd-3.8.1","cyrus-imapd-3.8.0","cyrus-imapd-3.8.0-rc1","cyrus-imapd-3.8.0-beta2","cyrus-imapd-3.8.0-beta1","cyrus-imapd-3.9.0-alpha0","cyrus-imapd-3.8.0-alpha0","cyrus-imapd-3.7.0-alpha0","cyrus-imapd-3.5.0-alpha0","cyrus-imapd-3.3.1","cyrus-imapd-3.3.0","cyrus-imapd-3.3.0-dev0","cyrus-imapd-3.1.9","cyrus-imapd-3.1.8","cyrus-imapd-3.1.7","cyrus-imapd-3.1.6","cyrus-imapd-3.1.5","cyrus-imapd-3.1.4","cyrus-imapd-3.1.3","cyrus-imapd-3.1.2","cyrus-imapd-3.1.1","cyrus-imapd-3.0.0-rc4","cyrus-imapd-3.1.0-dev","cyrus-imapd-3.0.0-rc3","cyrus-imapd-3.0.0-rc2","cyrus-imapd-3.0.0-rc1","cyrus-imapd-3.0.0-beta6","cyrus-imapd-3.0.0-beta5","cyrus-imapd-3.0.0-beta4","cyrus-imapd-3.0.0-beta3","cyrus-imapd-3.0.0-beta2","cyrus-imapd-3.0.0-beta1","posttab","pretab","cyrus-imapd-2.5-snapshot-autoconf-and-automake","cyrus-imapd-2.4.2","cyrus-imapd-2.4.1","cyrus-imapd-2.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61909.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N"}]}