CVE-2026-47081
LowCVSS 3.1Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In cyrus-imapd up to version 3.12.2, a vulnerability was found in the XAPPLEPUSHSERVICE command. An authenticated IMAP user can probe for the existence of arbitrary mailboxes on other users' accounts and hijack push notifications for new mail in those mailboxes to their own APNS device.
Risk Assessment
The risk involves privacy breach by revealing the existence of other users' mailboxes and the ability to hijack push notifications, potentially leaking information about mailbox activity (e.g., modseq changes) without accessing message content.
Recommendation
It is recommended to immediately upgrade cyrus-imapd to a version later than 3.12.2, which includes a fix for the vulnerability in the XAPPLEPUSHSERVICE command.
Original NVD description (English source)
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an XAPPLEPUSHSERVICE folder existence oracle and push hijack. An authenticated IMAP user could probe for the existence of arbitrary mailboxes on other users' accounts via the XAPPLEPUSHSERVICE command and then create Apple Push Notification Service notifications for new mail in those mailboxes to their own APNS device. This did not leak any data about the content of mailboxes. Instead, a "mailbox has changed" notice would be pushed when the mailbox modseq changed.