CVE-2026-47089

cyrus-imapd: Cyrus IMAP: Information disclosure via LISTRIGHTS

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. LISTRIGHTS os not limited to users with admin access. An authenticated user could call IMAP LISTRIGHTS against any mailbox they could name and learn what principals had what access to it. (This action should have been restricted to users with admin access on the target mailbox.)

Analysis

Technical impact

The flaw lies in the IMAP LISTRIGHTS command, which should only be used by administrators on a mailbox; in affected versions any authenticated user could invoke LISTRIGHTS for any mailbox name they could supply, learning which principals had what level of access and representing an authorization bypass classified as CWE-266 and CWE-862.

Affected Systems

The vulnerability existed in Cyrus IMAP up through release 3.12.2; users running 3.12.0 to 3.12.2 are impacted, and the issue was fixed in 3.12.3, so servers still on 3.12.2 or earlier remain susceptible.

Risk and Exploitability

The CVSS score of 4.3 indicates low‑to‑moderate severity, and an EPSS of <1% implies a very low exploitation probability; because the flaw requires an authenticated account, an attacker who compromises a user credential can easily retrieve additional mailbox permission information; the vulnerability is not listed in CISA’s KEV catalog and no public exploits have been documented, so overall risk is moderate, weighed against the low exploitation likelihood but the potential to expose internal access hierarchies.

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 newer, which restores proper access checks on LISTRIGHTS.
If an upgrade cannot be performed immediately, reconfigure the server to deny LISTRIGHTS to non‑administrator accounts, ensuring the command is only executable by privileged users.
Audit mailbox permissions to confirm that no unintended principals are exposed through LISTRIGHTS usage.

Generated by OpenCVE AI on August 1, 2026 at 08:47 UTC.

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4766-1	cyrus-imapd security update

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% (0.281% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://nvd.nist.gov/vuln/detail/CVE-2026-47089
https://www.cve.org/CVERecord?id=CVE-2026-47089
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 LISTRIGHTS
Weaknesses		CWE-266
References		https://nvd.nist.gov/vuln/detail/CVE-2026-47089 https://www.cve.org/CVERecord?id=CVE-2026-47089
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. LISTRIGHTS os not limited to users with admin access. An authenticated user could call IMAP LISTRIGHTS against any mailbox they could name and learn what principals had what access to it. (This action should have been restricted to users with admin access on the target mailbox.)
First Time appeared		Cyrusimap Cyrusimap cyrus Imap
Weaknesses		CWE-862
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'}`