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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. URLAUTH token forgery can occur via a missing mboxkey. If an attacker knew a folder name on the victim's account for which the victim had never issued an auth URL, they could forge a working URLAUTH token by computing an HMAC-SHA1 value with a predictable key, giving them read access to the mailbox. (URLAUTH is an obscure feature, meaning that the odds of any user actually being susceptible to this attack are very low. Perhaps no public clients use URLAUTH.)
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle. Changing version to 45.
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
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
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
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.
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.
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.
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.
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.
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.