Medium [CVE-2026-47089] Information disclosure via LISTRIGHTS
This medium-severity Red Hat Linux advisory covers CVE-2026-47089 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. LISTRIGHTS os not limited to users with admin access.
An authenticated user can exploit this vulnerability by using the IMAP LISTRIGHTS command. This allows the user to learn the access permissions of any mailbox they can name, which should be restricted to administrators.
This leads to unauthorized information disclosure regarding mailbox access controls. While requiring prior authentication, this bypasses intended administrative restrictions, potentially exposing sensitive access control configurations within a Red Hat deployment.
The impact is limited to information disclosure and does not grant further privileges or data modification. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).
Weakness: CWE-266. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: cyrus-imapd.
- 3.12.2
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- To mitigate this issue, restrict network access to the Cyrus IMAP service to only trusted clients and networks. This can be achieved by configuring firewall rules to limit inbound connections to the IMAP port (typically 143 for IMAP and 993 for IMAPS) on the server hosting cyrus-imapd. Additionally, ensure that only necessary users have authenticated access to the IMAP server.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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