Medium 4.3Published Sep 8, 2026

CVE-2026-61911An issue was discovered in Cyrus IMAP before 3.12.4.

Updated under an hour ago (Oct 29, 2026, 1:50 PM ET)

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It affects cyrusimap Cyrus IMAP and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-497
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Sep 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

cyrusimap Cyrus IMAP cyrusimap:cyrus_imap (from the name)	before 3.8.8; from 3.9.0 before 3.10.4; from 3.11.0 before 3.12.4	CNA record
cyrus imap cyrus:imap	before 3.8.8; from 3.9.0 before 3.10.4; from 3.11.0 before 3.12.4	NVD

References

References

https://cyrusimap.org	product
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html	release-notes
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html	release-notes
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html	release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.