CVE-2026-28284 Overview
CVE-2026-28284 is an authenticated SQL injection vulnerability [CWE-89] in the FreePBX logfiles module. FreePBX is an open source IP PBX (Private Branch Exchange) platform widely deployed for VoIP telephony management. The vulnerability affects all FreePBX versions prior to 16.0.10 and 17.0.5. Authenticated attackers can inject malicious SQL statements through the logfiles module to compromise the underlying database. Sangoma, the maintainer of FreePBX, has released patches addressing several SQL injection flaws in the affected component.
Critical Impact
Authenticated attackers with high privileges can execute arbitrary SQL queries against the FreePBX backend database, leading to confidentiality, integrity, and availability impact on stored telephony data and configuration.
Affected Products
- Sangoma FreePBX versions prior to 16.0.10
- Sangoma FreePBX versions prior to 17.0.5
- FreePBX logfiles module
Discovery Timeline
- 2026-03-05 - CVE-2026-28284 published to the National Vulnerability Database
- 2026-03-06 - Last updated in NVD database
Technical Details for CVE-2026-28284
Vulnerability Analysis
The FreePBX logfiles module contains multiple authenticated SQL injection vulnerabilities. The module accepts user-supplied input that is concatenated into SQL queries without proper parameterization or sanitization. Authenticated users with administrative access to the logfiles interface can manipulate query parameters to alter SQL statement structure.
Exploitation requires valid authenticated access with elevated privileges. Once authenticated, an attacker can submit crafted parameters to logfiles module endpoints. The injected SQL is executed in the context of the FreePBX database user, exposing call detail records, SIP credentials, voicemail data, and PBX configuration.
Because FreePBX commonly stores SIP secrets and trunk credentials in its database, successful exploitation can pivot into toll fraud or eavesdropping on voice communications.
Root Cause
The root cause is improper neutralization of special elements used in an SQL command [CWE-89]. Input passed to the logfiles module is interpolated directly into SQL queries rather than bound through prepared statements. Sangoma's patches in versions 16.0.10 and 17.0.5 address each affected query path within the module.
Attack Vector
The attack vector is network-based and requires authentication with high privileges. An attacker sends crafted HTTP requests to the FreePBX administrative web interface, targeting the logfiles module. No user interaction is required. See the FreePBX Security Advisory GHSA-4887-4jwp-327g for technical specifics.
No verified public proof-of-concept code is available. The vulnerability is described in prose only, consistent with vendor advisory disclosure.
Detection Methods for CVE-2026-28284
Indicators of Compromise
- Unusual HTTP POST or GET requests to FreePBX administrative endpoints associated with the logfiles module containing SQL metacharacters such as ', --, UNION, or SELECT.
- Unexpected database errors logged by Asterisk or the FreePBX web stack referencing the logfiles module.
- Authenticated administrative sessions originating from unfamiliar IP addresses or geolocations.
- Anomalous read activity against asterisk database tables containing SIP credentials or CDR records.
Detection Strategies
- Inspect FreePBX web server access logs for requests to logfiles module URLs containing encoded SQL syntax or tautology patterns.
- Deploy a Web Application Firewall (WAF) with SQL injection signatures in front of the FreePBX administrative interface.
- Enable MySQL or MariaDB general query logging on the FreePBX database to identify unusual query patterns originating from the web user.
- Correlate authentication events with subsequent logfiles module activity to identify compromised administrator accounts.
Monitoring Recommendations
- Monitor for failed administrative logins followed by successful logins from the same source, indicating potential credential brute forcing prior to exploitation.
- Alert on database errors or syntax exceptions emitted by the FreePBX application within short time windows.
- Track administrative session duration and query volume against historical baselines for the logfiles module.
How to Mitigate CVE-2026-28284
Immediate Actions Required
- Upgrade FreePBX to version 16.0.10, 17.0.5, or later according to your deployment branch.
- Rotate all administrative credentials and SIP secrets if exploitation is suspected.
- Restrict network access to the FreePBX administrative web interface to trusted management networks only.
- Audit administrator accounts and remove any unused or stale privileged users.
Patch Information
Sangoma has released fixed versions 16.0.10 and 17.0.5 of FreePBX. Apply the update through the FreePBX Module Admin interface or via the fwconsole command. Review the GitHub Security Advisory GHSA-4887-4jwp-327g for full patch details and module versions.
Workarounds
- Disable the logfiles module if it is not required for operations until patches are applied.
- Place the FreePBX administrative interface behind a VPN or IP allowlist to limit authenticated attack surface.
- Enforce multi-factor authentication on all FreePBX administrator accounts to reduce the likelihood of credential compromise.
- Apply a WAF rule set blocking SQL injection payloads targeting the FreePBX admin paths until upgrade completes.
# Upgrade FreePBX modules via fwconsole
fwconsole ma upgradeall
fwconsole reload
fwconsole restart
# Verify installed version of the logfiles module
fwconsole ma list | grep logfiles
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
