CVE-2026-47083

cyrus-imapd: Cyrus IMAP: Information disclosure via ESEARCH command

Published Jul 16, 2026 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Description

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).

Analysis

Technical impact

An authenticated IMAP user can send the ESEARCH command to any target account name. The server returns UIDs of messages that match the search, creating a content oracle. Although actual message bodies are not revealed, the oracle allows the attacker to enumerate which messages exist in folders of other users and, by inference, the presence of specific folders. This information exposure can aid social engineering or targeted attacks. The weakness maps to CWE-201 and CWE-204.

Affected Systems

The issue exists in the Cyrus IMAP server (cyrus-imapd) up to version 3.12.2. Versions 3.12.3 and later incorporate the fix.

Risk and Exploitability

The CVSS score of 4.3 indicates moderate severity. The EPSS score is below 1%, meaning the likelihood of exploitation is currently very low, and the vulnerability is not listed in CISA's KEV catalog. Nevertheless, the vulnerability requires valid IMAP credentials to be exploited, so its impact depends on the organization's authentication security. In environments where users have broad access, the oracle could be used to prepare more advanced attacks.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

cyrusimap

Cyrus IMAP

unaffected

Version	Status	Constraints
`0`	affected	< 3.12.3

No data.

Vendor Product Versions

Cyrusimap

Cyrus Imap

Version	Status	Scheme	Platform
`[0,3.12.3)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade Cyrus IMAP to version 3.12.3 or later.
Restrict the ESEARCH command to trusted users or networks.
Monitor IMAP logs for abnormal ESEARCH activity.

Generated by OpenCVE AI on July 31, 2026 at 02:29 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.306% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://nvd.nist.gov/vuln/detail/CVE-2026-47083
https://www.cve.org/CVERecord?id=CVE-2026-47083
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html
https://www.cyrusimap.org/imap/download/release-notes/index.html

History

Jul 18, 2026 12:15 PM Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Title		cyrus-imapd: Cyrus IMAP: Information disclosure via ESEARCH command
Weaknesses		CWE-201
References		https://nvd.nist.gov/vuln/detail/CVE-2026-47083 https://www.cve.org/CVERecord?id=CVE-2026-47083
Metrics	threat_severity `None`	threat_severity `Moderate`

Jul 16, 2026 7:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jul 16, 2026 6:45 PM Description updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).
First Time appeared		Cyrusimap Cyrusimap cyrus Imap
Weaknesses		CWE-204
CPEs		cpe:2.3:a:cyrusimap:cyrus_imap::::::::
Vendors & Products		Cyrusimap Cyrusimap cyrus Imap
References		https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html https://www.cyrusimap.org/imap/download/release-notes/index.html
Metrics		cvssV3_1 `{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}`