Vulnerability in Nextcloud Server
CVE-2023-39962
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.010 (62.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Nextcloud Server — versions 27.0.0
- Nextcloud Security-Advisories — versions >= 19.0.0, < 19.0.13.10, >= 20.0.0, < 20.0.14.15, >= 21.0.0, < 21.0.9.13
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-xwxx-2752-w3xm (Vendor Advisory)
- github.com/nextcloud/server/pull/39323 (Patch)
- hackerone.com/reports/2047168 (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-39962?
- CVE-2023-39962 is a high-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 7.7/10. Published 2023-08-10.
- How severe is CVE-2023-39962?
- High severity. CVSS v3 base score is 7.7 out of 10.