Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames

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Summary

CVECVE-2026-45264
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-01 17:17:09 UTC
Updated2026-06-01 18:14:29 UTC
DescriptionNextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can rename files in the team folder. This issue has been patched in versions 17.0.15, 18.1.12, 19.1.16, 20.1.11, and 21.0.4.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

EPSS: 0.000250000 probability, percentile 0.074620000 (date 2026-06-02)

Problem Types: CWE-284 | CWE-284 CWE-284: Improper Access Control

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nextcloud Security-advisories affected >= 17.0.0, < 17.0.15 Not specified
CNA Nextcloud Security-advisories affected >= 18.0.0, < 18.1.12 Not specified
CNA Nextcloud Security-advisories affected >= 19.0.0, < 19.1.16 Not specified
CNA Nextcloud Security-advisories affected >= 20.0.0, < 20.1.11 Not specified
CNA Nextcloud Security-advisories affected >= 21.0.0, < 21.0.4 Not specified

References

ReferenceSourceLinkTags
github.com/nextcloud/groupfolders/pull/4361 [email protected] github.com
github.com/nextcloud/security-advisories/security/advisories/GHSA-wx2x-8... [email protected] github.com
hackerone.com/reports/3540673 [email protected] hackerone.com
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