Detections
Analytics
CVE-2026-45286
medium
Description
Nextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user can enumerate users on the same Nextcloud instance by using the Calendar app's endpoint for suggesting attendees. The sharing restrictions, applied to other endpoints, were not effective here. This issue has been patched in versions 5.5.17 and 6.2.3.
References
https://hackerone.com/reports/3540663
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r697-74m9-gvf2