CVE-2025-66546 | THREATINT

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.

PUBLISHED Reserved 2025-12-04 | Published 2025-12-05 | Updated 2025-12-05 | Assigner GitHub_M

LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-639: Authorization Bypass Through User-Controlled Key

Product status

>= 6.0.0-rc.1, < 6.0.1

affected

>= 5.0.0-rc.1, < 5.5.6

affected

>= 3.0.0-beta1, < 4.7.19

affected

References

github.com/...sories/security/advisories/GHSA-7x2j-2674-fj95

github.com/nextcloud/calendar/pull/7537

github.com/...ommit/f41650c3681fc4a4130eb883f5c0899c011326b3

hackerone.com/reports/3275810

cve.org (CVE-2025-66546)

nvd.nist.gov (CVE-2025-66546)