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FreePBX remediated CVE-2025-57819, an insufficient input-validation vulnerability affecting FreePBX versions 15, 16, and 17. The flaw can let an attacker gain unauthorized access and potentially execute arbitrary code on affected PBX systems.
FreePBX reported active exploitation against multiple version 16 and 17 deployments with internet-exposed management interfaces, particularly where IP filtering and access-control lists (ACLs) were inadequate. Organizations should apply the vendor security updates, confirm the Endpoint module is at the required patched version, restrict administrator interfaces to trusted networks, and investigate exposed systems using FreePBX-provided indicators of compromise.
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2 events from the most recent confirmed update back to the earliest known activity.
FreePBX reported active exploitation affecting multiple internet-exposed version 16 and 17 systems with insufficient IP filtering and access-control lists on their management interfaces.
FreePBX remediated CVE-2025-57819 in versions 15, 16, and 17 by releasing security updates. The insufficient input-validation flaw can permit unauthorized access and potentially arbitrary code execution.
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FreePBX patched three serious vulnerabilities in the Endpoint Manager component that can be chained to give an attacker control of a vulnerable system. The issues include **CVE-2025-66039**, a critical authentication bypass tied to manipulation of the `Authorization` header to use the `webserver` authentication type, plus **CVE-2025-61675** and **CVE-2025-61678`, two high-severity flaws that enable SQL injection and arbitrary file upload. Researchers reported that, when combined, the bugs can let an unauthenticated attacker read and modify SQL database contents and upload files such as webshells, leading to remote code execution. The vulnerabilities affect FreePBX 16 before **16.0.44** and **16.0.92**, and FreePBX 17 before **17.0.6** and **17.0.23**. Reporting indicates the authentication bypass is not exploitable in a standard FreePBX configuration, but organizations with affected deployments were urged to update immediately and apply configuration mitigations where relevant. The disclosures highlight the risk of exposed PBX management components, particularly where Endpoint Manager is enabled and reachable by attackers.
Jul 24, 2026
FreePBX, the open-source IP PBX platform, has patched several critical vulnerabilities in its Endpoint Manager module that could allow attackers to bypass authentication and achieve remote code execution. Researchers from Horizon3.ai identified three high-severity flaws: CVE-2025-66039 (authentication bypass via forged Basic Auth headers when 'webserver' authorization is enabled), CVE-2025-61675 (multiple SQL injection vulnerabilities across several endpoints), and CVE-2025-61678 (arbitrary file upload enabling PHP webshell deployment). These vulnerabilities, when chained, allow unauthenticated attackers to gain full control over affected FreePBX instances, posing a significant risk to business communications infrastructure. The authentication bypass is not present in the default configuration but becomes exploitable if certain advanced settings are enabled. Attackers can exploit these flaws to access protected endpoints, manipulate the underlying SQL database, and upload malicious files for command execution. The vulnerabilities were responsibly disclosed to FreePBX maintainers, and patches have been released. Organizations using FreePBX, especially those with non-default authentication settings, are urged to update immediately to mitigate the risk of compromise.
Jun 29, 2026
Attackers have been exploiting **CVE-2025-64328**, a post-authentication command injection flaw in the *Sangoma FreePBX Endpoint Manager* (filestore component) to compromise internet-exposed FreePBX systems and deploy persistent web shells. The vulnerability affects FreePBX versions `17.0.2.36` and above prior to `17.0.3`, and can be abused by an authenticated user via the `testconnection -> check_ssh_connect()` function to execute commands and gain remote access as the `asterisk` user; the issue is fixed in **17.0.3**. Reporting indicates the activity began in **December 2025** and has left hundreds of systems persistently backdoored with web shells. The **Shadowserver Foundation** reported roughly **900** FreePBX instances still compromised, with the largest concentration in the **United States** (about **400**) and additional impacted systems across **Brazil, Canada, Germany, France, the UK, Italy, and the Netherlands**. Fortinet/FortiGuard Labs identified a PHP web shell dubbed **EncystPHP** associated with the campaign, which supports remote command execution, persistence, and additional web shell deployment; follow-on risk includes VoIP-focused abuse such as **outbound call fraud** and potential network pivoting from the PBX host. One source also states the vulnerability has been added to **CISA’s Known Exploited Vulnerabilities (KEV) Catalog**, reinforcing the need for rapid patching and incident response on exposed FreePBX deployments.
Jun 29, 2026