CVE-2026-61911
mediumAn issue was discovered in Cyrus IMAP before 3.12.4.
Vendor / product: Cyrus — imap
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
4.3 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Severity source: NVD CVSS v3.1 (cve@mitre.org)
Timeline (UTC)
Published: 2026-09-09 20:18
Modified: 2026-09-16 15:23
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 06:52 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
cyrus / imap <3.8.8, ≥3.9.0 <3.10.4, ≥3.11.0 <3.12.4
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://cyrusimap.org cve@mitre.org
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html cve@mitre.org
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html cve@mitre.org
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html cve@mitre.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:52 UTC · record ↗