Nextcloud Server up to 31.0.13/32.0.3 path traversal

Summaryinfo

A vulnerability described as critical has been identified in Nextcloud Server up to 31.0.13/32.0.3. The affected element is an unknown function. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2026-45279. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Nextcloud Server up to 31.0.13/32.0.3 and classified as problematic. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product 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 product 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. Impacted is confidentiality. CVE summarizes:

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

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-45279 since 05/11/2026. The exploitation is known to be difficult. The attack may be launched remotely. The exploitation needs additional levels of successful authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 31.0.14 or 32.0.4 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Cloud Software

Vendor

• Nextcloud

Name

• Server

Version

• 31.0.0
• 31.0.1
• 31.0.2
• 31.0.3
• 31.0.4
• 31.0.5
• 31.0.6
• 31.0.7
• 31.0.8
• 31.0.9
• 31.0.10
• 31.0.11
• 31.0.12
• 31.0.13
• 32.0.0
• 32.0.1
• 32.0.2
• 32.0.3

License

• open-source

Website

• Product: https://github.com/nextcloud/server/

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