Detections
Analytics
CVE-2025-66550
medium
Description
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.
References
https://hackerone.com/reports/3112033
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv
https://github.com/nextcloud/calendar/pull/6971
https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769