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CVE-2023-39962

Users can delete external storage mount points

HIGH
7.7
CVSS Score
Published: August 10, 2023 at 05:23 PM UTC
Updated: June 17, 2026 at 06:13 AM UTC
2 products affected across 1 vendorNextcloud/serverServer

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Severity
HIGH7.7
Exploit prediction
EPSS 1%
SSVC
PoC

Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 19.0.0 and prior to versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a malicious user could delete any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. As a workaround, disable app files_external. This also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.

Affected

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

Nextcloud/server· Nextcloudnextcloud-app
95%
19.0.0 ≤ v < 19.0.13.019.0.0 ≤ v < 19.0.13.1020.0.0 ≤ v < 20.0.14.1521.0.0 ≤ v < 21.0.9.1322.0.0 ≤ v < 22.2.10.1423.0.0 ≤ v < 23.0.12.924.0.0 ≤ v < 24.0.12.525.0.0 ≤ v < 25.0.926.0.0 ≤ v < 26.0.427.0.0 ≤ v < 27.0.119.0.020.0.021.0.022.0.023.0.024.0.025.0.026.0.027.0.0
Affected range stops below 19.0.13.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 19.0.13.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.0.14.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 21.0.9.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.2.10.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.0.12.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.0.12.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.0.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 26.0.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 27.0.1, so it looks safe — our inference, not a vendor statement
Server· Nextcloudnextcloud-app
60%
19.0.0 ≤ v < 19.0.13.020.0.0 ≤ v < 20.0.14.1521.0.0 ≤ v < 21.0.9.1322.0.0 ≤ v < 22.2.10.1423.0.0 ≤ v < 23.0.12.924.0.0 ≤ v < 24.0.12.525.0.0 ≤ v < 25.0.926.0.0 ≤ v < 26.0.427.0.0 ≤ v < 27.0.119.0.020.0.021.0.022.0.023.0.024.0.025.0.026.0.027.0.0
Affected range stops below 19.0.13.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.0.14.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 21.0.9.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.2.10.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.0.12.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.0.12.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.0.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 26.0.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 27.0.1, 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 (3)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xwxx-2752-w3xm
x_refsource_MISCPatch
Source: [email protected]
https://github.com/nextcloud/server/pull/39323
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/2047168

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

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

CVSS

7.7HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284

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