---
id: CVE-2026-45543
title: Nextcloud is an open source content collaboration platform
summary: >-
  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 u…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-552
vendor: nextcloud
product: forms
affected:
  - 'forms >= 4.3.0, < 5.2.7'
patched:
  - forms 5.2.7
published: '2026-06-01'
updated: '2026-07-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-45543'
references:
  - url: 'https://github.com/nextcloud/forms/pull/3291'
    label: security-advisories@github.com
  - url: >-
      https://github.com/nextcloud/security-advisories/security/advisories/GHSA-q4fw-6jf8-5vhh
    label: security-advisories@github.com
  - url: 'https://hackerone.com/reports/3617352'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00461
epssPercentile: 0.37267
ingestedAt: '2026-07-23T07:14:46.477Z'
---

## Overview

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.

## Affected

- `forms >= 4.3.0, < 5.2.7`

## Remediation

Upgrade past the affected range:

- `forms 5.2.7`