Auth bypass in Nextcloud Nextcloud_server

CVE-2026-45285

Nextcloud is an open source content collaboration platform. From versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a user shares a folder or file with a Nextcloud Team that includes an external member (a person added via…

Vulnerability class: Broken Access Control

EPSS: 0.000 (11.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-45285?
CVE-2026-45285 is a medium-severity vulnerability in Nextcloud Nextcloud_server, classified under Missing Authorization. CVSS score: 6.4/10. Published 2026-06-01.
How severe is CVE-2026-45285?
Medium severity. CVSS v3 base score is 6.4 out of 10.