An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. (CVE-2026-47084)
Description
Cyrus IMAP through version 3.12.2 contains a vulnerability where the LOCALDELETE command bypasses ACL checks. This allows an authenticated non-admin user to invoke the admin-only LOCALDELETE IMAP command and delete mailboxes without proper permissions. The vulnerability has a CVSS score of 6.5, indicating medium severity.
CVSS v3.1
Score 6.5medium
Affected software
pkg:deb/ubuntu/cyrus-imapd?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/cyrus-imapd?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/cyrus-imapd?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/cyrus-imapd?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/cyrus-imapd?arch=source&distro=stonkingpkg:deb/ubuntu/cyrus-imapd?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-47084 affects cyrus-imapd in Cyrus IMAP versions up to and including 3.12.2. The flaw is that the LOCALDELETE IMAP command does not enforce Access Control List (ACL) checks properly. As a result, an authenticated user without administrative privileges can execute this command to delete mailboxes they are not authorized to manage. This bypass of ACL restrictions compromises mailbox integrity by allowing unauthorized mailbox deletions.
Potential Impact
An authenticated but non-admin user can delete mailboxes for which they lack permissions, potentially causing data loss or disruption of email services. There is no indication of confidentiality or availability impact beyond mailbox deletion. The vulnerability does not require user interaction and has low attack complexity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the IMAP service to trusted users only and monitor for suspicious LOCALDELETE command usage. Avoid granting unnecessary IMAP privileges to non-admin users.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-47084
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f64c2cdf04f65666585b
Added to database: 10/17/2026, 22:27:24 UTC
Last enriched: 10/18/2026, 01:23:46 UTC
Last updated: 10/18/2026, 01:23:46 UTC
Views: 3
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