Vulnerability in Nextcloud Server
CVE-2023-39958
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, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, missing protection allows an attacker to brute force the client secrets of configured OAuth2 clients. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, 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 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.007 (51.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · 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, < 24.0.12.5
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-vv27-g2hq-v48h (Vendor Advisory)
- github.com/nextcloud/server/pull/38773 (Patch, Vendor Advisory)
- hackerone.com/reports/1258448 (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-39958?
- CVE-2023-39958 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 5.8/10. Published 2023-08-10.
- How severe is CVE-2023-39958?
- Medium severity. CVSS v3 base score is 5.8 out of 10.