CVE-2026-45279

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

MEDIUM

6.5

CVSS Score

Published: June 1, 2026 at 04:52 PM UTC

Updated: July 22, 2026 at 07:37 AM UTC

1 product affected across 1 vendorNextcloud/server

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nextcloud/server · Nextcloudnextcloud-app

95%

28.0.0 ≤ v < 28.0.14.1529.0.0 ≤ v < 29.0.17.1230.0.0 ≤ v < 30.0.17.731.0.0 ≤ v < 31.0.1432.0.0 ≤ v < 32.0.4

Affected range stops below 28.0.14.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 29.0.17.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 30.0.17.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 31.0.14, so it looks safe — our inference, not a vendor statement

Affected range stops below 32.0.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMMitigationVendor Advisory

Source: cverecord

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

x_refsource_MISCIssue TrackingPatch

Source: cverecord

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

x_refsource_MISCPermissions Required

Source: cverecord

https://hackerone.com/reports/3468140

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-22

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