An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. (CVE-2026-47083)
Description
Cyrus IMAP through version 3.12.2 contains a vulnerability in the cyrus-imapd component where an authenticated IMAP user can use the ESEARCH command to enumerate folder names under any account. This creates a cross-user content oracle by returning UIDs of messages matching the search, though it does not allow arbitrary reading of the target's message content. The issue has a medium severity rating with a CVSS score of 4.3.
CVSS v3.1
Score 4.3medium
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-2026-47083 describes a vulnerability in cyrus-imapd in Cyrus IMAP up to version 3.12.2. The flaw involves the ESEARCH command, which allows an authenticated IMAP user to enumerate folder names of any account they specify. The search results return UIDs of matching messages, effectively creating a content oracle that leaks metadata about other users' mailboxes without permitting direct access to message contents.
Potential Impact
An authenticated IMAP user can enumerate folder names and obtain message UIDs from other users' accounts, potentially leaking metadata about mailbox structure and message presence. However, the vulnerability does not allow reading the actual content of messages or modifying data. This limits the impact to information disclosure of mailbox metadata only.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, consider restricting IMAP user privileges or monitoring for suspicious use of the ESEARCH command if feasible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-47083
- 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: 6ad3f64d2cdf04f656665860
Added to database: 10/17/2026, 22:27:25 UTC
Last enriched: 10/18/2026, 01:23:51 UTC
Last updated: 10/18/2026, 01:23:51 UTC
Views: 3
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