low3.3
CVE-2025-66546
Nextcloud Calendar is a calendar app for Nextcloud.
Impact
Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.19, 5.5.6, and 6.0.1, the calendar app allowed blindly booking appointments with a squential ID without known the appointment token. This vulnerability is fixed in 4.7.19, 5.5.6, and 6.0.1.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Nextcloud | Calendar | from 4.0.0 before 4.7.19 from 5.0.0 before 5.5.6 Version 6.0.0 |