CVE-2026-61909
Publication date 9 September 2026
Last updated 11 September 2026
Ubuntu priority
Description
CalDAV/CardDAV multiget bypasses 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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| cyrus-imapd | 26.04 LTS resolute |
Needs evaluation
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
Notes
mrmajumder
Vendor patch for versions 3.8, 3.10 and 3.12 stored in the embargoed repository at fixes/cyrus-imapd/patches-<version>/CVE-2026-61909.patch. For versions older than 3.8, the 3.8 patches might need to be backported
Severity score breakdown
CVSS version: CVSS v3.0
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