Medium severity4.3NVD Advisory· Published Sep 9, 2026· Updated Sep 16, 2026
CVE-2026-61911
CVE-2026-61911
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4- Range: <3.12.4
Patches
Vulnerability mechanics
References
4- cyrusimap.orgnvdProduct
- www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.htmlnvdRelease Notes
- www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.htmlnvdRelease Notes
- www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.htmlnvdRelease Notes
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