CVE-2026-28287 is a high-severity command injection vulnerability affecting Sangoma FreePBX, an open-source IP PBX. The vulnerability exists in the recordings module, specifically in versions 16.0.17.2 to before 16.0.20 and from version 17.0.2.4 to before 17.0.5. The identified issues have been addressed in the patched versions 16.0.20 and 17.0.5. Organizations utilizing these vulnerable versions are at significant risk.
The severity of this vulnerability is classified as high, with a CVSS score of 8.6, indicating a critical need for immediate attention. This vulnerability allows for command injection, which can lead to unauthorized access and control over the affected systems.
Risk to organizations includes potential unauthorized actions that can be executed on the system, compromising sensitive data and overall system integrity. Given the nature of command injection vulnerabilities, the potential for exploitation is alarming, and organizations must act quickly.
Currently, there are no known exploits in the wild, but the high CVSS score indicates that attackers may leverage this vulnerability if left unpatched. Urgency is critical; organizations should prioritize patching immediately.
Vulnerability Details
This vulnerability allows for command injection in the recordings module of FreePBX. The vulnerability is classified under CWE-78, indicating it involves improper handling of commands. The CVSS score of 8.6 reflects a high severity level, with impacts on confidentiality, integrity, and availability being rated as high.
The affected versions include FreePBX versions 16.0.17.2 through to 16.0.20 and 17.0.2.4 through to 17.0.5. The vulnerabilities were disclosed on March 5, 2026, and have since been patched.
Technical Analysis
The root cause of this vulnerability is the improper validation of user inputs within the recordings module, allowing attackers to inject arbitrary commands. The attack vector is network-based, and the attack complexity is low, as it does not require advanced skills to exploit.
The privileges required for exploiting this vulnerability are high, meaning an attacker must have elevated access to the system. User interaction is not required, making it easier for attackers to exploit the vulnerability remotely.
The confidentiality, integrity, and availability impacts are all rated high, indicating that successful exploitation could lead to a complete compromise of the affected system, including the potential for data leaks.
Organizations must ensure that they monitor for any signs of exploitation and reinforce their defensive measures.
Risk & Impact Analysis
Real-world deployment risk is significant due to the widespread use of FreePBX in various organizations. The blast radius potential is high, as successful exploitation could lead to unauthorized access to sensitive communications and system control.
Organizations should assess their exposure to this vulnerability and understand the criticality of patching systems that are still using the affected versions. Given the high CVSS score and the potential for exploitation, urgency is high.
This vulnerability is not included in the KEV (Known Exploited Vulnerabilities) catalog; however, given its severity, organizations should not dismiss the possibility of future exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The specific affected versions of FreePBX are from 16.0.17.2 to before 16.0.20 and from 17.0.2.4 to before 17.0.5. Organizations should ensure they upgrade to at least version 16.0.20 or 17.0.5 to mitigate this vulnerability.
Mitigation & Remediation
Organizations are advised to patch their systems by upgrading to FreePBX versions 16.0.20 or 17.0.5 immediately. If an upgrade cannot be performed, organizations should implement strict network controls and monitor their systems for anomalous activities. For further assistance, organizations can utilize penetration testing services to identify potential vulnerabilities.
Detection Guidance
Organizations should monitor logs for unusual commands and unexpected changes in system behavior. Implementing network signatures that detect attempts to exploit this vulnerability can also help mitigate risks.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-28287 reflects ongoing concerns regarding command injection vulnerabilities within widely used platforms like FreePBX. Organizations should learn from this incident to enhance their security posture, particularly concerning input validation and command execution.
This vulnerability highlights the importance of robust security measures in preventing unauthorized access. Security teams must remain vigilant and proactive in identifying vulnerabilities and implementing effective remediation strategies. For insights on improving security practices, explore our vulnerability management program and consider our penetration testing methodology for best practices.
By learning from vulnerabilities like CVE-2026-28287, organizations can better prepare for future threats and enhance their overall security framework.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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