High severity · published Nov 21, 2023
CVE-2023-48239
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform
7.1
CVSS
1%
EPSS
No
On KEV
Description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and starting in version 20.0.0 and prior to versions 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Enterprise Server, a malicious user could update any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud Server 25.0.13, 26.0.8, and 27.1.3 and Nextcloud Enterprise Server is upgraded to 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 contain a patch for this issue. As a workaround, disable app files_external. This workaround 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:U/C:N/I:L/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 61% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
20.0.0 before 20.0.14.16; 21.0.0 before 21.0.9.13; 22.0.0 before 22.2.10.15; 23.0.0 before 23.0.12.12; 24.0.0 before 24.0.12.8; 25.0.0 before 25.0.13; +5 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-48239
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-48239
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f962-hw26-g267
Patch
https://github.com/nextcloud/server/pull/41123
Exploit
https://hackerone.com/reports/2212627
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