CVE-2026-45279 Nextcloud: Limited path traversal via template API if using `{lang}` in config
Non-admin users can copy arbitrary files into their directory via path traversal if the template config uses {lang}, requiring an upgrade.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45279?
CVE-2026-45279 is a medium-severity path traversal vulnerability in Nextcloud Nextcloud Server, published on 1 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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
Weakness: CWE-22
Which versions are affected by CVE-2026-45279?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2026-45279?
No fix has been published for CVE-2026-45279 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-45279 being exploited?
There is no known exploitation of CVE-2026-45279 in the wild and no public exploit code.
Other vulnerabilities in Nextcloud Nextcloud Server
- CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server
- CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server
- CVE-2018-3775 Auth bypass in Nextcloud Server
- CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected
- CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended
Sources
Also known as GHSA-j33j-qph5-4wch.