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
- Nextcloud Forms
- Nextcloud Security-advisories — versions >= 4.3.0, < 5.2.7
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Permissions Required, x_refsource_MISC)
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.