Path Traversal in Nextcloud Server
CVE-2026-45279
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 31.0.0 to before 31.0.14, and 32.0.0 to before 32.0.4, if {lang} is used in the template directory config value, non-admin users can in some cases copy arbitrary files (depending on unix permissions) into their own Nextcloud directory via a path traversal. It is recommended that the Nextcloud Server is upgraded to 32.0.4, 31.0.14. It is recommended that the Nextcloud Enterprise Server is upgraded to 32.0.4, 31.0.14, 30.0.17.7, 29.0.17.12, 28.0.14.15
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Nextcloud Server
- Nextcloud Security-Advisories — versions >= 31.0.0, < 31.0.14, >= 32.0.0, < 32.0.4
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-j33j-qph5-4wch (Mitigation, Vendor Advisory)
- github.com/nextcloud/server/pull/57414/files (Patch, Issue Tracking)
- hackerone.com/reports/3468140 (Permissions Required)
Frequently asked questions
- What is CVE-2026-45279?
- CVE-2026-45279 is a medium-severity vulnerability in Nextcloud Server, classified under Path Traversal. CVSS score: 4.4/10. Published 2026-06-01.
- How severe is CVE-2026-45279?
- Medium severity. CVSS v3 base score is 4.4 out of 10.