CVE-2026-45279: Nextcloud Server

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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

Affected products

• Nextcloud Nextcloud Server: from 31.0.0, before 31.0.14 (fixed in 31.0.14); from 32.0.0, before 32.0.4 (fixed in 32.0.4); from 28.0.0, before 28.0.14.15 (fixed in 28.0.14.15); from 29.0.0, before 29.0.17.12 (fixed in 29.0.17.12); from 30.0.0, before 30.0.17.7 (fixed in 30.0.17.7)

Published 2026-06-01. Last modified 2026-07-22.