Vulnerability in Nextcloud Server
CVE-2023-39959
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.9, 26.0.4, and 27.0.1, unauthenticated users could send a DAV request which reveals whether a calendar or an address book with the given identifier exists for the victim. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 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 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (47.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.0% 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 — versions 27.0.0
- Nextcloud Security-Advisories — versions >= 25.0.0, < 25.0.9, >= 26.0.0, < 26.0.4, >= 27.0.0, < 27.0.1
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-g97r-8ffm-hfpj (Vendor Advisory)
- github.com/nextcloud/server/pull/38747 (Patch)
- hackerone.com/reports/1832126 (Permissions Required)
Frequently asked questions
- What is CVE-2023-39959?
- CVE-2023-39959 is a low-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 3.5/10. Published 2023-08-10.
- How severe is CVE-2023-39959?
- Low severity. CVSS v3 base score is 3.5 out of 10.