CVE-2026-45543: CWE-552: Files or Directories Accessible to External Parties in nextcloud security-advisories
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.
AI Analysis
Technical Summary
CVE-2026-45543 is a vulnerability in Nextcloud's security-advisories component affecting versions 4.3.0 through before 5.2.7. It allows a removed collaborator to continue reading uploaded respondent files for forms where they previously had results access, violating intended access controls. The issue is limited in scope to those specific uploaded files. This vulnerability is classified under CWE-552 (Files or Directories Accessible to External Parties). The vulnerability has been patched in version 5.2.7.
Potential Impact
An unauthorized user who was previously a collaborator on a form can retain read access to uploaded files associated with that form even after their collaborator access is revoked. This could lead to unintended disclosure of potentially sensitive respondent data. There is no indication of impact on data integrity or availability. The vulnerability is rated medium severity with a CVSS score of 5.3.
Mitigation Recommendations
Upgrade Nextcloud to version 5.2.7 or later, where this vulnerability has been patched. Since this is an on-premises product, administrators must apply the update to remediate the issue. Patch status is confirmed by the vendor advisory stating the fix is included in version 5.2.7.
CVE-2026-45543: CWE-552: Files or Directories Accessible to External Parties in nextcloud security-advisories
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.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-45543 is a vulnerability in Nextcloud's security-advisories component affecting versions 4.3.0 through before 5.2.7. It allows a removed collaborator to continue reading uploaded respondent files for forms where they previously had results access, violating intended access controls. The issue is limited in scope to those specific uploaded files. This vulnerability is classified under CWE-552 (Files or Directories Accessible to External Parties). The vulnerability has been patched in version 5.2.7.
Potential Impact
An unauthorized user who was previously a collaborator on a form can retain read access to uploaded files associated with that form even after their collaborator access is revoked. This could lead to unintended disclosure of potentially sensitive respondent data. There is no indication of impact on data integrity or availability. The vulnerability is rated medium severity with a CVSS score of 5.3.
Mitigation Recommendations
Upgrade Nextcloud to version 5.2.7 or later, where this vulnerability has been patched. Since this is an on-premises product, administrators must apply the update to remediate the issue. Patch status is confirmed by the vendor advisory stating the fix is included in version 5.2.7.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-12T17:48:47.879Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1de306e29bf47b503a5595
Added to database: 6/1/2026, 7:52:38 PM
Last enriched: 6/1/2026, 8:04:50 PM
Last updated: 6/2/2026, 6:11:43 AM
Views: 7
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