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Nextcloud CVE-2026-45279

| EUVDEUVD-2026-33705 MEDIUM
Path Traversal (CWE-22)
2026-06-01 GitHub_M
Path Traversal Nextcloud Security Advisories
6.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
CVSS changed
Jul 22, 2026 - 07:22 NVD
4.4 (MEDIUM) 6.5 (MEDIUM)
Patch available
Jun 01, 2026 - 20:02 EUVD
Source Code Evidence Fetched
Jun 01, 2026 - 19:33 vuln.today
Analysis Generated
Jun 01, 2026 - 19:33 vuln.today

DescriptionNVD

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

AnalysisAI

Path traversal in Nextcloud Server 31.x and 32.x allows authenticated non-admin users to copy arbitrary server-side files into their own Nextcloud storage directory when an administrator has configured the {lang} placeholder in the template directory config value. The root cause is insufficient sanitization of the forceLanguage HTTP request parameter and the ACCEPT_LANGUAGE header in lib/private/L10N/Factory.php, which were used unsanitized in filesystem path construction. No public exploit identified at time of analysis, though a HackerOne report (3468140) exists; CVSS scores this as Medium (4.4) due to high complexity and privilege preconditions, and impact is limited to confidentiality with no code execution possible.

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CVE-2026-45279 vulnerability details – vuln.today
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