CVE-2025-66546

Published Dec 5, 2025

Last updated 5 months ago

Overview

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.
Source
security-advisories@github.com
NVD status
Analyzed
Products
calendar

Risk scores

CVSS 3.1

Type
Secondary
Base score
3.3
Impact score
1.4
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Severity
LOW

Weaknesses

security-advisories@github.com
CWE-639

Social media

Hype score
Not currently trending

Configurations