Vulnerability in Nextcloud Server
CVE-2023-39963
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 20.0.0 and prior to versions 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 missing password confirmation allowed an attacker, after successfully stealing a session from a logged in user, to create app passwords for the victim. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 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. No known workarounds are available.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.003 (18.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Nextcloud Server — versions 27.0.0
- Nextcloud Security-Advisories — versions >= 20.0.0, < 20.0.14.15, >= 21.0.0, < 21.0.9.13, >= 22.0.0, < 22.2.10.14
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-j4qm-5q5x-54m5 (Vendor Advisory)
- github.com/nextcloud/server/pull/39416 (Patch)
- hackerone.com/reports/2067572 (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-39963?
- CVE-2023-39963 is a high-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 8.1/10. Published 2023-08-10.
- How severe is CVE-2023-39963?
- High severity. CVSS v3 base score is 8.1 out of 10.