High severity · published Aug 10, 2023
CVE-2023-39962
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform
7.7
CVSS
1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 63% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
19.0.0 before 19.0.13.10; 20.0.0 before 20.0.14.15; 21.0.0 before 21.0.9.13; 22.0.0 before 22.2.10.14; 23.0.0 before 23.0.12.9; 24.0.0 before 24.0.12.5; +6 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-39962
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-39962
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xwxx-2752-w3xm
Patch
https://github.com/nextcloud/server/pull/39323
Third Party Advisory
https://hackerone.com/reports/2047168
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