Vulnerability Database

314,496

Total vulnerabilities in the database

CVE-2025-66550

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.17 and 5.2.4, when a malicious user creates a calendar event with a crafted attachment that links to a download link of a file on the same Nextcloud server, the file would be downloaded without the user confirming the action. This vulnerability is fixed in 4.7.17 and 5.2.4.

  • Published: Dec 5, 2025
  • Updated: Dec 6, 2025
  • CVE: CVE-2025-66550
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.7
  • AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

CWEs:

Software From Fixed in
nextcloud / calendar 4.0.0 4.7.17
nextcloud / calendar 5.0.0 5.2.4