CVE-2026-47081

Name	CVE-2026-47081
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
cyrus-imapd (PTS)	bullseye	3.2.6-2+deb11u2	vulnerable
	bullseye (security)	3.2.6-2+deb11u4	vulnerable
	bookworm	3.6.1-4+deb12u4	vulnerable
	bookworm (security)	3.6.1-4+deb12u2	vulnerable
	trixie	3.10.2-1	vulnerable
	forky	3.12.2-1	vulnerable
	sid	3.12.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
cyrus-imapd	source	(unstable)	3.12.3-1

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html