Auth bypass in Nextcloud Server
CVE-2023-48304
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and starting in version 22.0.0 and prior to versions 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Enterprise Server, an attacker could enable and disable the birthday calendar for any user on the same server. Nextcloud Server 25.0.11, 26.0.6, and 27.1.0 and Nextcloud Enterprise Server 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 contain patches for this issue. No known workarounds are available.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Nextcloud Server
- Nextcloud Security-Advisories — versions >= 25.0.0, < 25.0.11, >= 26.0.0, < 26.0.6, >= 27.0.0, < 27.1.0
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-8jwv-c8c8-9fr3 (Vendor Advisory)
- github.com/nextcloud/server/pull/40292 (Patch, Issue Tracking)
- hackerone.com/reports/2112973 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-48304?
- CVE-2023-48304 is a medium-severity vulnerability in Nextcloud Server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2023-11-21.
- How severe is CVE-2023-48304?
- Medium severity. CVSS v3 base score is 4.3 out of 10.