Bug 2501664

Summary: CVE-2026-47081 cyrus-imapd: Cyrus IMAP: Information disclosure of mailbox existence via XAPPLEPUSHSERVICE command [fedora-all]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: cyrus-imapdAssignee: Martin Osvald 🛹 <mosvald>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: 45CC: fhrdina, jorton, j, mosvald, pavel, zdohnal
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["1d07e0cd-59c7-4ee7-b293-c2760aa056e2"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2501453    

Description Ganesh 2026-07-17 03:47:08 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Aoife Moloney 2026-08-17 15:22:07 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.