CVE-2025-66546

low

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.

References

https://hackerone.com/reports/3275810

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95

https://github.com/nextcloud/calendar/pull/7537

https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3

Details

Source: Mitre, NVD

Published: 2025-12-05

Updated: 2025-12-05

Risk Information

CVSS v2

Base Score: 1.7

Vector: CVSS2#AV:L/AC:L/Au:S/C:P/I:N/A:N

Severity: Low

CVSS v3

Base Score: 3.3

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Severity: Low