CVE-2026-45543: Nextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible through a lingering Files share

Published Jun 1, 2026
·
Updated

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 Software

2 affected components
Nextcloud Nextcloud Forms>=4.3.0<5.2.7
Nextcloud forms>=4.3.0<5.2.7

Remediation

Patch Available

https://github.com/nextcloud/forms/pull/3291

Event History

Jun 1, 2026
CVE Published
via MITRE·05:00 PM
Data Sourced
via MITRE·05:00 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·07:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-45543?

The severity of CVE-2026-45543 is rated as medium with a score of 5.3.

2

How do I fix CVE-2026-45543?

To fix CVE-2026-45543, upgrade Nextcloud Forms to version 5.2.7 or later.

3

What are the potential risks associated with CVE-2026-45543?

The potential risks associated with CVE-2026-45543 include unauthorized read access to uploaded response files by removed collaborators.

4

Which versions of Nextcloud are affected by CVE-2026-45543?

CVE-2026-45543 affects Nextcloud versions from 4.3.0 to before 5.2.7.

5

What is the impact of CVE-2026-45543 on data privacy?

CVE-2026-45543 may compromise data privacy by allowing previously removed collaborators to access sensitive respondent files.

Company

Resources

Contact

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CVE-2026-45543 - Nextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible through a lingering Files share - SecAlerts