Is CVE-2026-61909 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-61909?

CVE-2026-61909 has a CVSS v3 severity of LOW (3.5).

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CVE-2026-61909

Description

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.