CVE-2026-61909
Published:September 09, 2026
Updated:September 22, 2026
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.
Affected Packages
https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.9.0-alpha0 <cyrus-imapd-3.10.4Fix Suggestion:
Update to version cyrus-imapd-3.10.4https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.11.0-alpha0 <cyrus-imapd-3.12.4Fix Suggestion:
Update to version cyrus-imapd-3.12.4https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.7.0-alpha0 <cyrus-imapd-3.8.8Fix Suggestion:
Update to version cyrus-imapd-3.8.8Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Unprotected Alternate Channel
EPSS
Base Score:
0.20