What is CVE-2026-61909?

CVE-2026-61909 is a low-severity vulnerability in Cyrusimap Cyrus Imap, classified under Unprotected Alternate Channel. CVSS score: 3.5/10. Published 2026-09-09.

How severe is CVE-2026-61909?

Low severity. CVSS v3 base score is 3.5 out of 10.

Vulnerability in Cyrusimap Cyrus Imap

CVE-2026-61909

An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or addressbook-multiget REPORT.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N.

Affected products

Cyrusimap Cyrus Imap

Weakness classification (CWE)

CWE-420 — Unprotected Alternate Channel

References

cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-61909?: CVE-2026-61909 is a low-severity vulnerability in Cyrusimap Cyrus Imap, classified under Unprotected Alternate Channel. CVSS score: 3.5/10. Published 2026-09-09.
How severe is CVE-2026-61909?: Low severity. CVSS v3 base score is 3.5 out of 10.