CVE-2026-45279: Nextcloud: Limited path traversal via template API if using `{lang}` in config

Medium severity · published Jun 1, 2026

CVE-2026-45279

Nextcloud: Limited path traversal via template API if using `{lang}` in config

6.5

CVSS

0.4%

EPSS

On KEV

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack vector

Network

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

High

Integrity

None

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.4% · higher than 33% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

security-advisories · nextcloud

>= 31.0.0, < 31.0.14; >= 32.0.0, < 32.0.4 · source: vendor

Nextcloud Server · Nextcloud

31.0.0 before 31.0.14; 32.0.0 before 32.0.4; 28.0.0 before 28.0.14.15; 29.0.0 before 29.0.17.12; 30.0.0 before 30.0.17.7; 31.0.0 before 31.0.14; +1 more · source: NVD

Affected product

security-advisories

nextcloud

All security-advisories CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-45279

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-45279

Mitigation

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-j33j-qph5-4wch

Issue Tracking

https://github.com/nextcloud/server/pull/57414/files

Permissions Required

https://hackerone.com/reports/3468140