CVE-2023-39962

Users can delete external storage mount points

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.

Category

7.7
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.24%
Vendor Advisory github.com
Affected: nextcloud security-advisories
Published at:
Updated at:

References

Link Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xwxx-2752-w3xm vendor advisory
https://github.com/nextcloud/server/pull/39323 patch
https://hackerone.com/reports/2047168 third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-39962?
CVE-2023-39962 has been scored as a high severity vulnerability.
How to fix CVE-2023-39962?
To fix CVE-2023-39962, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-39962 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-39962 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-39962?
CVE-2023-39962 affects nextcloud security-advisories.
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