CVE-2026-20141: Splunk Enterprise Information Disclosure

CVE-2026-20141 Overview

CVE-2026-20141 is an improper access control vulnerability affecting Splunk Enterprise that allows low-privileged users without the "admin" Splunk role to access the Splunk Monitoring Console App endpoints. This security flaw could lead to sensitive information disclosure by exposing administrative monitoring data to unauthorized users.

The Monitoring Console app is a bundled application that comes with Splunk Enterprise installations. It is not available for download on SplunkBase, and notably, is not installed on Splunk Cloud Platform instances. This vulnerability does not affect Cloud Monitoring Console.

Critical Impact

Low-privileged users can access Monitoring Console endpoints intended for administrators, potentially exposing sensitive system configuration and operational data.

Affected Products

• Splunk Enterprise versions below 10.0.2
• Splunk Enterprise versions below 10.0.3
• Splunk Enterprise versions below 9.4.8
• Splunk Enterprise versions below 9.3.9

Discovery Timeline

• 2026-02-18 - CVE CVE-2026-20141 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-20141

Vulnerability Analysis

This vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The improper access control implementation in Splunk Enterprise's Monitoring Console App fails to properly validate user privileges before granting access to administrative endpoints. While intended for users holding the "admin" Splunk role, the flawed authorization mechanism allows low-privileged authenticated users to query these endpoints directly.

The attack vector is network-based, requiring low privileges and no user interaction. An authenticated attacker with minimal permissions can exploit this vulnerability to access monitoring data that should be restricted to administrative users only.

Root Cause

The root cause stems from insufficient access control checks within the Monitoring Console App's endpoint handlers. The application fails to properly enforce role-based access restrictions, allowing requests from authenticated users who lack the requisite "admin" role to reach protected monitoring endpoints. This represents a broken access control pattern where authorization decisions are either missing or improperly implemented at the application layer.

Attack Vector

An attacker exploits this vulnerability through the following attack chain:

1. The attacker obtains valid credentials for a low-privileged Splunk Enterprise user account
2. The attacker authenticates to the Splunk Enterprise instance
3. Without holding the "admin" role, the attacker directly requests Monitoring Console App endpoints
4. Due to the improper access control, the server processes these requests and returns sensitive monitoring data
5. The attacker gains access to system configuration details, operational metrics, and other administrative information

The vulnerability requires network access to the Splunk Enterprise instance and valid authentication credentials, but does not require administrative privileges—making it exploitable by any authenticated user within the organization.

Detection Methods for CVE-2026-20141

Indicators of Compromise

• Unusual access patterns to Monitoring Console endpoints from non-admin user accounts
• HTTP requests to /en-US/splunkd/__raw/servicesNS/-/splunk_monitoring_console/ or similar monitoring endpoints from low-privileged sessions
• Audit logs showing repeated access to monitoring resources by users without admin roles
• Anomalous data access volumes from standard user accounts

Detection Strategies

• Enable and review Splunk's internal audit logging to track access to Monitoring Console endpoints
• Create correlation searches to alert when non-admin users access monitoring endpoints
• Deploy network monitoring to detect unusual API call patterns to Splunk administrative endpoints
• Implement SIEM rules to flag privilege-boundary violations in Splunk access logs

Monitoring Recommendations

• Review Splunk audit logs regularly for unauthorized access attempts to administrative endpoints
• Implement alerting for any access to Monitoring Console App resources from non-admin role accounts
• Monitor for enumeration behavior patterns that may indicate reconnaissance activity
• Establish baseline normal access patterns for Monitoring Console endpoints to detect anomalies

How to Mitigate CVE-2026-20141

Immediate Actions Required

• Upgrade Splunk Enterprise to version 10.0.2, 10.0.3, 9.4.8, 9.3.9 or later immediately
• Audit current user roles and permissions to identify potentially impacted accounts
• Review access logs for evidence of prior exploitation
• Restrict network access to Splunk Enterprise instances to authorized networks only

Patch Information

Splunk has released security patches addressing this vulnerability. Organizations should upgrade to the following fixed versions:

• Splunk Enterprise 10.0.2 or later
• Splunk Enterprise 10.0.3 or later
• Splunk Enterprise 9.4.8 or later
• Splunk Enterprise 9.3.9 or later

For complete patch details and download information, refer to the Splunk Security Advisory SVD-2026-0206.

Workarounds

• Implement network segmentation to restrict access to Splunk Enterprise management interfaces to trusted networks only
• Use firewall rules or access control lists to limit which IP addresses can reach Monitoring Console endpoints
• Conduct a user access review to minimize the number of accounts with any Splunk Enterprise access
• Consider temporarily disabling or restricting access to the Monitoring Console App until patching is complete

# Example: Restrict access to Splunk web interface at firewall level
# Adjust IP ranges according to your authorized admin networks
iptables -A INPUT -p tcp --dport 8000 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8000 -j DROP