VULNERABILITY INTELLIGENCE

CVE-2026-45286

CVSS score4.3 MEDIUM

EPSS probability0.28%

CISA KEVNot currently listed

Published2026-06-01

Last modified2026-07-22

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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.

Weakness classification

security-advisories@github.com: CWE-200
nvd@nist.gov: NVD-CWE-noinfo

Primary references

security-advisories@github.com — Exploit, Issue Tracking, Patch
security-advisories@github.com — Issue Tracking, Patch
security-advisories@github.com — Mitigation, Vendor Advisory
security-advisories@github.com — Permissions Required