CVE-2023-39952

Advanced permissions not respected when copying entire group folders

MEDIUM

6.5

CVSS Score

Published: August 10, 2023 at 01:50 PM UTC

Updated: June 17, 2026 at 06:13 AM UTC

1 product affected across 1 vendorNextcloud/server

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.8%

SSVC

No known exploit

Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1, a user can access files inside a subfolder of a groupfolder accessible to them, even if advanced permissions would block access to the subfolder. Nextcloud Server versions 25.0.8, 26.0.3, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1 contain a patch for this issue. No known workarounds are available.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nextcloud/server · Nextcloudnextcloud-app

95%

22.0.0 ≤ v < 22.2.10.1323.0.0 ≤ v < 23.0.12.824.0.0 ≤ v < 24.0.12.425.0.0 ≤ v < 25.0.826.0.0 ≤ v < 26.0.327.0.0

Affected range stops below 22.2.10.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.0.12.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.0.12.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.0.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 26.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCIssue TrackingThird Party Advisory

Source: [email protected]

https://github.com/nextcloud/groupfolders/issues/1906

x_refsource_CONFIRMPatchVendor Advisory

Source: [email protected]

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-cq8w-v4fh-4rjq

x_refsource_MISCPatch

Source: [email protected]

https://github.com/nextcloud/server/pull/38890

x_refsource_MISCPermissions Required

Source: [email protected]

https://hackerone.com/reports/1808079

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-284

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