Vulnerability 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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Calendar | >= 4.0.0, < 4.7.19 |
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011Patch
- https://github.com/nextcloud/calendar/pull/7537Issue Tracking
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2PatchVendor Advisory
- https://hackerone.com/reports/3275810Issue TrackingVendor Advisory
FAQ
What is CVE-2025-66546?
CVE-2025-66546 is a vulnerability with a CVSS score of 3.3 (LOW). 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. Th...
How severe is CVE-2025-66546?
CVE-2025-66546 has been rated LOW with a CVSS base score of 3.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-66546?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Calendar.