CVE-2026-45543 Details
Description
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.
A vulnerability in the Nextcloud Forms application, affecting versions 4.3.0 through prior to 5.2.7, allows removed collaborators to retain unauthorized read access to respondent files uploaded for forms where they previously had access to results. This issue arises because the file shares are not properly revoked when a collaborator is removed, leaving a gap in file access control.
Users are advised to upgrade the Nextcloud Forms app to version 5.2.7. Alternatively, the Forms app can be disabled.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 1, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nextcloud/forms/pull/3291 | [email protected] | Issue TrackingPatch |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-q4fw-6jf8-5vhh | [email protected] | MitigationVendor Advisory |
| https://hackerone.com/reports/3617352 | [email protected] | Permissions Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-552 | Files or Directories Accessible to External Parties | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| nextcloud forms | >= 4.3.0, < 5.2.7 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 4, 2026 | Initial Analysis | [email protected] |
| Jun 1, 2026 | New CVE Received | [email protected] |