CVE-2026-61907: Cyrusimap Cyrus Imap

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Cyrusimap Cyrus Imap: before 3.8.8 (fixed in 3.8.8); from 3.9.0, before 3.10.4 (fixed in 3.10.4); from 3.11.0, before 3.12.4 (fixed in 3.12.4)

Published 2026-09-09. Last modified 2026-09-14.