CVE-2026-45286
Medium · 4.3CVSS
4.3
EPSS
0.5%
Published
Jun 1, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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