CVE-2025-66550
MEDIUMNextcloud Calendar <4.7.17-5.2.4 - Info Disclosure
Title source: llmDescription
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.
Scores
CVSS v3
5.7
EPSS
0.0003
EPSS Percentile
6.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Classification
CWE
CWE-241
Status
published
Affected Products (1)
nextcloud/calendar
< 4.7.17
Timeline
Published
Dec 05, 2025
Tracked Since
Feb 18, 2026