Nextcloud Server path traversal copy file via {lang} tmpl (31.013 & 32.03)
CVE-2026-45279 Published on June 1, 2026
Nextcloud: Limited path traversal via template API if using `{lang}` in config
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 Analysis
CVE-2026-45279 can be exploited with network access, and requires user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is a Directory traversal Vulnerability?
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2026-45279 has been classified to as a Directory traversal vulnerability or weakness.
Affected Versions
nextcloud security-advisories:- Version >= 31.0.0, < 31.0.14 is affected.
- Version >= 32.0.0, < 32.0.4 is affected.