Vulnerability in Nextcloud Server
CVE-2023-39952
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1, a user can access files inside a subfolder of a groupfolder accessible to them, even if advanced permissions would block access to the subfolder. Nextcloud Server versions 25.0.8, 26.0.3, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1 contain a patch for this issue. No known workarounds are available.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.008 (55.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Nextcloud Server — versions 27.0.0
- Nextcloud Security-Advisories — versions >= 22.0.0, < 22.2.10.13, >= 23.0.0, < 23.0.12.8, >= 24.0.0, < 24.0.12.4
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-cq8w-v4fh-4rjq (Patch, Vendor Advisory)
- github.com/nextcloud/groupfolders/issues/1906 (Third Party Advisory, Issue Tracking)
- github.com/nextcloud/server/pull/38890 (Patch)
- hackerone.com/reports/1808079 (Permissions Required)
Frequently asked questions
- What is CVE-2023-39952?
- CVE-2023-39952 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 6.5/10. Published 2023-08-10.
- How severe is CVE-2023-39952?
- Medium severity. CVSS v3 base score is 6.5 out of 10.