CVE-2026-47081 Information disclosure in Cyrus IMAP
Authenticated users can probe mailbox existence and hijack push notifications in Cyrus IMAP, leaking metadata about other users' mailboxes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47081?
CVE-2026-47081 is a low-severity vulnerability in cyrusimap Cyrus IMAP, published on 16 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-47081?
How do I fix CVE-2026-47081?
Upgrade to a fixed version.
Is CVE-2026-47081 being exploited?
There is no known exploitation of CVE-2026-47081 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-47081, GHSA-w8cp-9j4g-wc9p, UBUNTU-CVE-2026-47081.