CVE-2026-30811: Pandora FMS Information Disclosure Flaw

CVE-2026-30811 Overview

CVE-2026-30811 is a Missing Authorization vulnerability in Pandora FMS that allows unauthorized exposure of sensitive information through a configuration endpoint. This issue affects Pandora FMS versions 777 through 800, enabling authenticated attackers with low privileges to access sensitive configuration data that should be restricted to higher-privileged users.

Critical Impact

Attackers with low-level access can exploit this vulnerability to retrieve sensitive configuration information, potentially exposing credentials, internal network details, and system architecture data that could facilitate further attacks.

Affected Products

• Pandora FMS versions 777 through 800

Discovery Timeline

• 2026-04-13 - CVE-2026-30811 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2026-30811

Vulnerability Analysis

This vulnerability stems from CWE-276 (Incorrect Default Permissions), where the Pandora FMS application fails to properly enforce authorization checks on its configuration endpoint. The flaw allows authenticated users with minimal privileges to access sensitive configuration data that should be protected by role-based access controls.

The vulnerability is network-accessible and requires only low-level privileges to exploit, with no user interaction necessary. While the vulnerability does not allow modification of data (no integrity impact), it poses a significant risk due to the high confidentiality impact, potentially exposing sensitive system configuration, credentials, and internal infrastructure details.

Root Cause

The root cause of CVE-2026-30811 is improper implementation of authorization controls on the configuration endpoint within Pandora FMS. The application fails to validate whether the authenticated user has sufficient privileges to access the requested configuration data. This missing authorization check allows any authenticated user, regardless of their assigned role or permissions, to retrieve sensitive configuration information.

Attack Vector

The attack is conducted over the network against the Pandora FMS web interface. An attacker who has obtained low-level access credentials (or compromised a low-privilege account) can directly access the vulnerable configuration endpoint without triggering any authorization checks. The attack requires:

1. Valid low-privilege credentials for Pandora FMS
2. Network access to the Pandora FMS web interface
3. Direct request to the configuration endpoint

The vulnerability manifests when the application serves sensitive configuration data without verifying the requesting user's authorization level. This could expose database credentials, API keys, SNMP community strings, or other sensitive monitoring infrastructure details. For technical details, refer to the Pandora FMS Vulnerability Guide.

Detection Methods for CVE-2026-30811

Indicators of Compromise

• Unusual access patterns to configuration endpoints from low-privilege user accounts
• Repeated requests to configuration-related API endpoints from accounts that typically do not access administrative functions
• Log entries showing successful configuration data retrieval by non-administrative users

Detection Strategies

• Implement monitoring for access to sensitive configuration endpoints and alert on requests from non-administrative users
• Review application access logs for unauthorized configuration endpoint access patterns
• Deploy web application firewalls (WAF) with rules to detect and alert on configuration endpoint enumeration attempts

Monitoring Recommendations

• Enable detailed logging for all configuration endpoint access in Pandora FMS
• Configure SIEM alerts for configuration data access by users outside the administrator group
• Monitor for bulk data extraction patterns or unusual data volumes in responses from configuration endpoints

How to Mitigate CVE-2026-30811

Immediate Actions Required

• Upgrade Pandora FMS to a version newer than 800 that includes the security fix
• Review and audit user accounts to ensure principle of least privilege is enforced
• Implement network segmentation to restrict access to Pandora FMS management interfaces
• Enable additional authentication controls such as multi-factor authentication for all Pandora FMS users

Patch Information

Pandora FMS has addressed this vulnerability in releases after version 800. Organizations should upgrade to the latest available version to receive the security fix. Refer to the Pandora FMS Vulnerability Guide for official patch information and upgrade instructions.

Workarounds

• Restrict network access to Pandora FMS configuration endpoints using firewall rules or reverse proxy access controls
• Implement additional authorization layers through a reverse proxy that validates user roles before allowing access to sensitive endpoints
• Conduct regular audits of user privileges and remove unnecessary access rights from low-privilege accounts

# Example: Restrict access to configuration endpoints via nginx
location /api/config {
    # Restrict to specific IP ranges or require additional authentication
    allow 10.0.0.0/8;
    deny all;
    
    # Or implement basic auth as additional layer
    auth_basic "Restricted Access";
    auth_basic_user_file /etc/nginx/.htpasswd;
    
    proxy_pass http://pandorafms_backend;
}