CVE-2026-35479: InvenTree Privilege Escalation Vulnerability

CVE-2026-35479 Overview

CVE-2026-35479 is an Improper Authorization vulnerability affecting InvenTree, an Open Source Inventory Management System. The flaw exists in versions prior to 1.2.7 and 1.3.0, where users with staff access permissions can install plugins via the API without requiring superuser account access. This inconsistency in permission requirements creates a privilege escalation path, as other plugin actions such as uninstalling require superuser access.

Critical Impact

Staff users with lower trust levels can install arbitrary and potentially malicious plugins, bypassing the intended authorization controls and compromising system integrity.

Affected Products

• InvenTree versions prior to 1.2.7
• InvenTree versions prior to 1.3.0

Discovery Timeline

• 2026-04-08 - CVE-2026-35479 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-35479

Vulnerability Analysis

This vulnerability is classified under CWE-285 (Improper Authorization), which occurs when a system fails to properly enforce access restrictions. In InvenTree, the plugin installation API endpoint does not correctly validate whether the requesting user has superuser privileges. Instead, it permits any user with staff access to execute plugin installation operations.

The security model of InvenTree assumes different trust levels for staff users versus superusers. Superuser accounts are intended to have full administrative control, including the ability to install and manage plugins that could execute arbitrary code. Staff accounts, by design, should have more limited permissions. This vulnerability breaks that trust boundary by allowing staff users to perform an action reserved for superusers.

The impact of this flaw is significant because plugins in InvenTree can execute arbitrary Python code within the application context. A malicious staff user could install a crafted plugin to exfiltrate data, modify inventory records, establish persistence, or pivot to other systems on the network.

Root Cause

The root cause is an inconsistent authorization check in the plugin installation API endpoint. While other plugin management functions (such as uninstalling plugins) correctly require superuser access, the installation endpoint only checks for staff-level permissions. This asymmetric permission model creates an exploitable gap where lower-privileged staff users can escalate their capabilities.

Attack Vector

The vulnerability is exploitable over the network by any authenticated user with staff access. An attacker would authenticate to the InvenTree instance with valid staff credentials, then make API requests to install malicious plugins. No user interaction is required beyond the attacker's own actions, and the attack can impact resources beyond the vulnerable component's security scope.

The attack flow involves:

1. Authenticating to InvenTree with a staff-level account
2. Crafting or obtaining a malicious plugin package
3. Submitting an API request to the plugin installation endpoint
4. The system installs and potentially activates the malicious plugin
5. The attacker gains elevated capabilities through the plugin's execution context

For technical details on the vulnerability and exploitation, refer to the GitHub Security Advisory GHSA-7c3q-vwcv-2vp7.

Detection Methods for CVE-2026-35479

Indicators of Compromise

• Unexpected plugin installations in the InvenTree plugins directory
• API requests to plugin installation endpoints from staff (non-superuser) accounts
• Newly installed plugins with unknown or untrusted sources
• Unusual application behavior or network connections originating from the InvenTree server

Detection Strategies

• Review application logs for plugin installation API calls and correlate with user privilege levels
• Audit the plugins directory for unauthorized or unexpected plugin additions
• Implement alerting on plugin management API endpoints for non-superuser accounts
• Monitor for changes to plugin configuration files or database records

Monitoring Recommendations

• Enable comprehensive API request logging including user identity and endpoint accessed
• Configure file integrity monitoring on plugin directories and configuration files
• Establish baseline of authorized plugins and alert on deviations
• Review staff account activity logs regularly for suspicious plugin-related operations

How to Mitigate CVE-2026-35479

Immediate Actions Required

• Upgrade InvenTree to version 1.2.7 or 1.3.0 immediately
• Audit existing plugins for any unauthorized or suspicious installations
• Review staff account permissions and remove unnecessary access
• Check application logs for any historical exploitation attempts

Patch Information

The vulnerability has been fixed in InvenTree versions 1.2.7 and 1.3.0. Organizations should update to one of these patched versions as soon as possible. The fix implements proper superuser authorization checks on the plugin installation API endpoint, aligning it with other plugin management operations.

For additional context on the security model and plugin configuration, refer to the InvenTree Threat Model Overview and InvenTree Plugin Configuration Guide.

Workarounds

• Disable the plugin system entirely if not required for business operations using configuration options
• Restrict staff account provisioning to only essential personnel until patching is complete
• Implement network-level access controls to limit API access to trusted networks
• Use a web application firewall to block requests to plugin installation endpoints from non-superuser sessions

# Configuration example - Disable plugins in InvenTree configuration
# Add to config.yaml or environment variables
INVENTREE_PLUGINS_ENABLED=false