CVE-2026-64948: Pandora FMS Auth Bypass Vulnerability

CVE-2026-64948 Overview

CVE-2026-64948 is a missing authorization vulnerability [CWE-639] in Pandora FMS that allows unauthorized cross-group access to module history data. The flaw affects Pandora FMS versions 777 and later. Authenticated users with low privileges can retrieve module history belonging to groups they are not entitled to access, breaking the tenant isolation model enforced by group-based access control.

Critical Impact

Authenticated attackers can read module history data across group boundaries, exposing monitoring telemetry and operational data that should remain restricted to authorized groups.

Affected Products

• Pandora FMS version 777
• Pandora FMS versions after 777
• Pandora FMS module data retrieval component

Discovery Timeline

• 2026-10-01 - CVE-2026-64948 published to the National Vulnerability Database (NVD)
• 2026-10-01 - Last updated in NVD database

Technical Details for CVE-2026-64948

Vulnerability Analysis

The vulnerability resides in the module data retrieval logic of Pandora FMS. The application exposes an interface for fetching module history records but fails to verify whether the requesting user belongs to the group that owns the target module. This classifies as Authorization Bypass Through User-Controlled Key [CWE-639], a form of Insecure Direct Object Reference (IDOR).

An authenticated attacker with any valid low-privilege account can submit requests referencing module identifiers assigned to other groups. The backend returns the historical data without enforcing a group membership check. Pandora FMS uses groups as the primary tenancy and segregation boundary, so cross-group data exposure defeats its multi-tenant isolation guarantees.

Impact is limited to confidentiality. Integrity and availability of the monitored systems and the Pandora FMS instance remain intact, as the flaw only affects read operations against historical module records.

Root Cause

The root cause is a missing authorization check in the module history retrieval code path. The application authenticates the session but does not authorize access to the specific resource identified in the request. Group ownership is not validated against the caller's group memberships before data is returned.

Attack Vector

Exploitation requires network access to the Pandora FMS web interface and valid, low-privilege credentials. User interaction is not required. The attacker iterates or guesses module identifiers across groups and issues retrieval requests. The server responds with history data regardless of the caller's group assignment, enabling bulk extraction of monitoring data.

For technical details on the vulnerability class, refer to the Pandora FMS CVE Overview.

Detection Methods for CVE-2026-64948

Indicators of Compromise

• Web server access logs showing a single authenticated user requesting module history for a wide range of module identifiers in short time windows.
• Requests to module data retrieval endpoints referencing module IDs tied to groups that the authenticated account does not belong to.
• Elevated outbound response volume from Pandora FMS to a single session enumerating module IDs sequentially.

Detection Strategies

• Correlate authenticated user sessions with the group ownership of the modules they query, and alert on cross-group access patterns.
• Baseline normal module history query volume per user and flag deviations consistent with enumeration behavior.
• Review audit logs for repeated access to historical data endpoints from accounts with limited group assignments.

Monitoring Recommendations

• Forward Pandora FMS application and web server logs to a centralized log platform for retention and query.
• Monitor response sizes and request rates against module data retrieval endpoints for anomalies.
• Track authentication events and session activity for low-privilege accounts that exhibit broad data access patterns.

How to Mitigate CVE-2026-64948

Immediate Actions Required

• Inventory all Pandora FMS deployments and identify instances running version 777 or later.
• Restrict network access to the Pandora FMS console to trusted administrative networks until a fix is applied.
• Audit low-privilege accounts and disable or rotate credentials for any accounts no longer required.
• Review historical access logs for signs of cross-group module history retrieval.

Patch Information

Consult the Pandora FMS CVE Overview for vendor advisories and fixed version information. Apply the vendor-supplied update as soon as it is available for the affected versions.

Workarounds

• Limit account provisioning to the minimum set of users required to operate the platform while a patch is pending.
• Enforce strict group membership reviews and remove unused or legacy accounts that could be abused to reach the vulnerable endpoint.
• Place the Pandora FMS web interface behind a reverse proxy or VPN to reduce the exposed attack surface.
• Enable verbose audit logging on module data retrieval endpoints to support investigation.

# Example: restrict access to the Pandora FMS console at the reverse proxy layer
# Replace with the appropriate trusted CIDR ranges for your environment
location / {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://pandora_fms_backend;
}