PT-2026-45531 · Nextcloud · Security-Advisories

Published 2026-06-01 · Updated 2026-06-01 · CVE-2026-45543

NVD

CVSS v3.1

5.3

Medium

Base vector

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

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 uploaded files for forms where that user previously had results access. This issue has been patched in version 5.2.7.

Fix

Files Accessible to External Parties

Weakness Enumeration

CWE-552

Related Identifiers

CVE-2026-45543

Affected Products

Security-Advisories

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-45543 · Security Note
• https://github.com/nextcloud/forms/pull/3291 · Note
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-q4fw-6jf8-5vhh · Note
• https://hackerone.com/reports/3617352 · Note