Sangoma FreePBX Administrative Authentication Bypass (CVE-2019-19006)

Historical catalog analysis: CISA added this entry on February 03, 2026. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2019-19006 is an improper authentication vulnerability (CWE-287) affecting Sangoma FreePBX. The flaw potentially allows an unauthorized user to bypass password authentication requirements, granting them access to services provided by the FreePBX administrative interface.

Exposure and applicability

This vulnerability applies to organizations deploying Sangoma FreePBX. Because the flaw targets the administrative services, exposure is highest for instances where the admin interface is accessible over a network without additional compensating layers of security. Infrastructure owners should identify all active FreePBX deployments to determine if they are running versions susceptible to this bypass.

Remediation priorities

Based on our analysis, vulnerability management teams should prioritize the following actions:

1. Apply Vendor Mitigations: The primary corrective action is to implement mitigations as specified by Sangoma. This is the most direct method to address the authentication bypass logic.
2. Review Cloud Service Exposure: For deployments hosted in cloud environments, we recommend aligning with BOD 22-01 guidance to ensure that administrative interfaces are not unnecessarily exposed to the public internet.
3. Evaluate Product Viability: In scenarios where vendor mitigations cannot be applied or are unavailable for a specific legacy version, organizations should consider discontinuing use of the product to eliminate the risk of unauthorized administrative access.

How to validate remediation

Verification must go beyond a simple version check, as a deployed update does not always guarantee that the configuration is secure. To verify that exposure has been reduced, defenders should:

• Test Authentication Enforcement: Attempt to access the FreePBX admin services without valid credentials to confirm that the password bypass is no longer functional.
• Audit Access Logs: Review administrative logs for any evidence of unauthorized access attempts or successful logins from unexpected IP addresses prior to and after the fix.
• Verify Network Isolation: Confirm that administrative interfaces are restricted to authorized management networks, reducing the attack surface regardless of the patch status.

Limits and open questions

It remains unknown whether this vulnerability has been utilized in ransomware campaigns. Additionally, while CISA has established a remediation deadline for federal agencies, this date does not automatically apply to private sector organizations. Residual risk persists if administrative interfaces remain exposed to untrusted networks, as other undiscovered authentication flaws may exist.

Source and editorial note

CVE-2019-19006: Sangoma FreePBX Improper Authentication Vulnerability · Source date: February 03, 2026 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: February 06, 2026. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 22, 2026 at 00:11 UTC.

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