CVE-2026-61911
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-497 |
| Vendor | cyrusimap |
| Product | cyrus imap |
| Published | Sep 9, 2026 |
| Last Updated | Sep 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
cyrusimap / Cyrus IMAP
0 < 3.8.8 3.9.0 < 3.10.4 3.11.0 < 3.12.4
References
cyrusimap.org: https://cyrusimap.org cyrusimap.org: https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html cyrusimap.org: https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html cyrusimap.org: https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html