CVE-2026-61911

Published: Sep 9, 2026Modified: Sep 16, 2026

4.3

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploitability: 2.8 / Impact: 1.4

Source: MITRE (Secondary)

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.

Affected (3)

Products: Cyrus: Imap

1 product

Configuration A

3 vulnerable

Vulnerable Software	Affected Versions
Cyrus Imap	version < 3.8.8
Cyrus Imap	3.11.0 ≤ version < 3.12.4
Cyrus Imap	3.9.0 ≤ version < 3.10.4

Related CWEs

Exposure of Sensitive System Information to an Unauthorized Control Sphere

The product does not properly prevent sensitive system-level information from being accessed by unauthorized actors who do not have the same level of access to the underlying system as the product does.

References (4)

https://cyrusimap.org

Source: cve@mitre.org

Product

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html

Source: cve@mitre.org

Release Notes

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html

Source: cve@mitre.org

Release Notes

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html

Source: cve@mitre.org

Release Notes

Timeline

No history available yet.