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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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Vulnerability Assessment

Weakness
CWE
CWE-22
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Path canonicalization, traversal prevention
MITRE ATT&CK

2 techniques across 2 tactics: Discovery, Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 01, 2026

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.

Affected VersionsENISA

security-advisories 32.0.0, < 32.0.4
security-advisories 31.0.0, < 31.0.14

Affected Packages

euvd security_advisories_31_0_0 fix: 31.0.14
euvd security_advisories_32_0_0 fix: 32.0.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in euvd

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  • Exploit and PoC references, threat intelligence from 22 sources
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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

2
CVSS changed
Jul 22, 2026 - 07:22 NVD
4.4 (MEDIUM) 6.5 (MEDIUM)
Patch available
Jun 01, 2026 - 20:02 EUVD

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

Threat Intelligence Overview

EPSS Score
0.0%
Top 91% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

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Same technique Path Traversal

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References

Advisories & patches
ADVISORY https://vuldb.com/vuln/367736 REF https://github.com/nextcloud/security-advisories/security/advisories/GHSA-j33j-qph5-4wch REF https://github.com/nextcloud/server/pull/57414/files REF https://hackerone.com/reports/3468140

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