CVE-2026-61911

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.

Scoring

Severity

MEDIUM

CVSS base score

4.3

CVSS vector

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

EPSS probability

0.22%

CWE

CWE-497

Published

2026-09-09

Last modified

2026-09-10

Affected products

• cyrusimap Cyrus IMAP
• cyrusimap Cyrus IMAP
• cyrusimap Cyrus IMAP

Weakness type

• CWE-497

Related vulnerabilities

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• CVE-2026-71330 — Windows Services for NFS ONCRPC XDR Driver Information Disclosure Vulnerability
• CVE-2026-69832 — Win32k Information Disclosure Vulnerability
• CVE-2026-69723 — Windows Kernel Information Disclosure Vulnerability
• CVE-2026-69406 — Windows Kernel Information Disclosure Vulnerability

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