CVE-2026-6290: Velociraptor Auth Bypass Vulnerability

CVE-2026-6290 Overview

CVE-2026-6290 is an Improper Authorization vulnerability (CWE-863) in Velociraptor, an open-source digital forensics and incident response tool. Velociraptor versions prior to 0.76.3 contain a vulnerability in the query() plugin which allows authenticated users to access all organizations with their current ACL token. This flaw enables an authenticated GUI user with access to one organization to use the query() plugin within a notebook cell to run VQL (Velociraptor Query Language) queries on other organizations they may not have legitimate access to.

Critical Impact

Authenticated users can bypass organizational boundaries to access, query, and potentially exfiltrate data from other organizations within the same Velociraptor deployment, with their permissions in unauthorized organizations mirroring their permissions in the original organization.

Affected Products

• Velociraptor versions prior to 0.76.3

Discovery Timeline

• April 15, 2026 - CVE-2026-6290 published to NVD
• April 15, 2026 - Last updated in NVD database

Technical Details for CVE-2026-6290

Vulnerability Analysis

The vulnerability resides in the query() plugin implementation within Velociraptor's VQL processing engine. The core issue is an improper authorization check that fails to properly validate organizational boundaries when processing VQL queries through the notebook interface.

When a user executes VQL queries using the query() plugin from a notebook cell, the system incorrectly allows the user's current ACL token to be applied across all organizations rather than restricting access to only the organization context in which the notebook exists. This represents a horizontal privilege escalation scenario where organizational isolation—a fundamental security boundary in multi-tenant Velociraptor deployments—is effectively bypassed.

The attack is particularly concerning because the user retains their full permission set when accessing other organizations. If a user has administrative privileges in their home organization, those same privileges apply when querying unauthorized organizations through this vulnerability.

Root Cause

The root cause is an Improper Authorization flaw (CWE-863) in the query() plugin's ACL token handling. The plugin fails to enforce proper organizational context validation when processing queries, allowing the user's authentication token to be honored across organizational boundaries without verifying the user has been explicitly granted access to the target organization.

Attack Vector

An attacker requires authenticated access to the Velociraptor GUI with notebook creation or editing privileges in at least one organization. From there, the attacker can craft VQL queries using the query() plugin that target other organizations within the deployment. The attack is network-accessible and does not require user interaction, though it does require high privileges (authenticated GUI access with notebook capabilities). The scope is changed as it affects resources beyond the vulnerable component's authorization boundary.

The attack flow involves:

1. Attacker authenticates to Velociraptor GUI with valid credentials for Organization A
2. Attacker creates or edits a notebook cell in Organization A
3. Attacker uses the query() plugin to execute VQL queries targeting Organization B, C, or any other organization
4. The vulnerability allows the query to execute with the attacker's Organization A permissions applied to the target organization

Detection Methods for CVE-2026-6290

Indicators of Compromise

• Unusual VQL query activity in notebook cells targeting organization contexts different from the notebook's home organization
• Audit logs showing query() plugin invocations with cross-organizational scope
• Unexpected data access patterns where users access organizations they are not explicitly assigned to
• Anomalous notebook creation or modification activity followed by bulk data queries

Detection Strategies

• Monitor Velociraptor audit logs for query() plugin usage patterns that reference multiple organizational contexts
• Implement alerting on notebook cell executions that contain VQL queries with org-switching patterns
• Review user activity logs for access to organizational data that does not match user assignment records
• Deploy behavioral analytics to detect users accessing data volumes inconsistent with their normal access patterns

Monitoring Recommendations

• Enable comprehensive audit logging for all notebook activities and VQL query executions
• Implement log correlation to identify users executing queries outside their assigned organizational context
• Establish baseline user behavior profiles to detect anomalous cross-organization query patterns
• Review and monitor ACL token usage patterns across organizational boundaries

How to Mitigate CVE-2026-6290

Immediate Actions Required

• Upgrade Velociraptor to version 0.76.3 or later immediately
• Audit existing notebooks for any suspicious query() plugin usage that may indicate exploitation
• Review access logs for any cross-organization query activity prior to patching
• Temporarily restrict notebook creation and editing privileges to trusted administrators until patching is complete

Patch Information

The vulnerability is addressed in Velociraptor version 0.76.3. Organizations should upgrade to this version or later to remediate the vulnerability. Detailed patch information is available in the Velociraptor Security Advisory.

Workarounds

• Restrict notebook creation and editing privileges to only highly trusted users until the patch can be applied
• Disable or limit access to the query() plugin through ACL policy if operationally feasible
• Implement additional network segmentation to limit exposure of the Velociraptor GUI
• Increase audit logging verbosity and implement real-time monitoring for notebook activity

# Example: Restrict notebook permissions in Velociraptor configuration
# Consult official documentation for your specific deployment
# Limit notebook access to administrators only until patch is applied
velociraptor config rotate --org "your-org" --notebook-acl "administrators-only"