Vulnerability in Nextcloud Forms

CVE-2026-45543

Nextcloud is an open source content collaboration platform. From version 4.3.0 to before version 5.2.7, a removed collaborator retains unauthorized read access to uploaded respondent files for the affected form. The scope is limited to upl…

EPSS: 0.000 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-45543?
CVE-2026-45543 is a medium-severity vulnerability in Nextcloud Forms, classified under Files or Directories Accessible to External Parties. CVSS score: 5.3/10. Published 2026-06-01.
How severe is CVE-2026-45543?
Medium severity. CVSS v3 base score is 5.3 out of 10.