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VULNERABILITIES

CVE-2026-61911 Details

Description

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired during LMTP delivery.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://cyrusimap.org [email protected]Product
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html [email protected]Release Notes
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html [email protected]Release Notes
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html [email protected]Release Notes

Weakness Enumeration

CWE-IDCWE NameSource
CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere[email protected]

Affected Products

ProductVersions
cyrus imap
< 3.8.8
>= 3.9.0, < 3.10.4
>= 3.11.0, < 3.12.4

CPE

  • cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-61911
NVD Published Date:
Sep 9, 2026
NVD Last Modified:
Sep 16, 2026
Source:
[email protected]
CVE-2026-61911 Details - Not Deferred