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: CLOSED ERRATA 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"]}
Fixed In Version: cyrus-imapd-3.12.4-1.fc45 cyrus-imapd-3.10.4-1.fc43 cyrus-imapd-3.12.4-1.fc44 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-23 00:16:00 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
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.

Comment 2 Fedora Update System 2026-09-14 07:16:16 UTC
FEDORA-2026-3bf3e31ef4 (cyrus-imapd-3.12.4-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3bf3e31ef4

Comment 3 Fedora Update System 2026-09-14 07:17:44 UTC
FEDORA-2026-740bc1c6fa (cyrus-imapd-3.12.4-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-740bc1c6fa

Comment 4 Fedora Update System 2026-09-14 07:19:10 UTC
FEDORA-2026-97a7ec5786 (cyrus-imapd-3.10.4-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-97a7ec5786

Comment 5 Fedora Update System 2026-09-15 01:26:01 UTC
FEDORA-2026-3bf3e31ef4 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-3bf3e31ef4`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3bf3e31ef4

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-15 01:41:36 UTC
FEDORA-2026-740bc1c6fa has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-740bc1c6fa`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-740bc1c6fa

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-09-15 02:03:46 UTC
FEDORA-2026-97a7ec5786 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-97a7ec5786`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-97a7ec5786

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 8 Fedora Update System 2026-09-23 00:16:00 UTC
FEDORA-2026-3bf3e31ef4 (cyrus-imapd-3.12.4-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-09-23 00:57:35 UTC
FEDORA-2026-97a7ec5786 (cyrus-imapd-3.10.4-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 10 Fedora Update System 2026-09-23 01:09:05 UTC
FEDORA-2026-740bc1c6fa (cyrus-imapd-3.12.4-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.