CVE-2026-61911
4.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| cyrusimap | Cyrus IMAP | 0 < 3.8.8 | affected |
| cyrusimap | Cyrus IMAP | 3.9.0 < 3.10.4 | affected |
| cyrusimap | Cyrus IMAP | 3.11.0 < 3.12.4 | affected |
Weaknesses
- CWE-497: CWE-497 Exposure of Sensitive System Information to an Unauthorized Control Sphere
References
- https://cyrusimap.org
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html
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