VULNERABILITY INTELLIGENCE

CVE-2025-66546

CVSS score3.3 LOW

EPSS probability0.14%

CISA KEVNot currently listed

Published2025-12-05

Last modified2026-10-18

Description

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.