Nextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible through a lingering Files share

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Summary

CVECVE-2026-45543
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-01 19:16:51 UTC
Updated2026-06-04 16:43:12 UTC
DescriptionNextcloud 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.000290000 probability, percentile 0.087790000 (date 2026-06-09)

Problem Types: CWE-552 | CWE-552 CWE-552: Files or Directories Accessible to External Parties

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Nextcloud Forms All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nextcloud Security-advisories affected >= 4.3.0, < 5.2.7 Not specified

References

ReferenceSourceLinkTags
github.com/nextcloud/forms/pull/3291 [email protected] github.com Issue Tracking, Patch
github.com/nextcloud/security-advisories/security/advisories/GHSA-q4fw-6... [email protected] github.com Mitigation, Vendor Advisory
hackerone.com/reports/3617352 [email protected] hackerone.com Permissions Required
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