Attackers Exploit Critical Sangoma Switchvox SQL Injection Flaw CVE-2026-9586 to Deploy Reverse Shells Without Credentials

A critical vulnerability in Sangoma Switchvox allows unauthenticated remote code execution through SQL injection in the /pa HTTP endpoint. The flaw, tracked as CVE-2026-9586 with a CVSS score of 9.3, affects internet-exposed VoIP deployments common in SMB environments. Attackers have already leveraged the issue in active campaigns since August 30, 2026, to open reverse shells and perform reconnaissance using Base64-encoded commands. The root cause is improper handling of the PhoneIP parameter in PostgreSQL queries, classified as CWE-89, which grants superuser database privileges. Sangoma released the fix in Switchvox 8.4.0.2 on July 14, 2026, following initial disclosure in April. Administrators are urged to patch immediately, restrict access, and monitor for indicators such as connections to 176.65.148.184 and suspicious entries in /var/log/switchvox/db-quirks.log.

HispasecSeptember 2, 2026Translated from Spanish

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Administrators of VoIP systems and IT security teams face an urgent new threat: a critical vulnerability in Sangoma Switchvox that enables remote code execution without any credentials. The flaw, identified as CVE-2026-9586 and rated CVSS 9.3, has already been exploited in real-world attacks to deploy reverse shells since August 30, 2026.

The vulnerability resides in the HTTP endpoint /pa, which processes XML requests. The system inserts the PhoneIP value directly into PostgreSQL queries without proper sanitization or parameterization. This classic CWE-89 SQL injection pattern allows attackers to run arbitrary database commands and escalate to full system command execution with PostgreSQL superuser privileges.

Observed attack activity includes the immediate opening of reverse shells and basic reconnaissance. Attackers use Base64-encoded commands to enumerate running processes and map the compromised server environment. One IP address linked to the campaign is 176.65.148.184. Forensic traces may appear in the log file /var/log/switchvox/db-quirks.log, which records attempted SQL injections and subsequent actions.

Patch Availability and Timeline

Sangoma released the corrective update in Switchvox 8.4.0.2 on July 14, 2026. The patch addresses the injection flaw along with additional web portal fixes. The disclosure timeline shows the initial report to the vendor on April 10, 2026, the patch release in mid-July, and confirmed exploitation by late August.

Thousands of Switchvox instances remain reachable from the internet, with a notable concentration in the United States. Organizations should prioritize immediate upgrades to version 8.4.0.2 or later, especially for any deployments exposed to untrusted networks.

Recommended Mitigations and Detection

Apply the Switchvox 8.4.0.2 update without delay.
Restrict access to the HTTP service using network segmentation, VPNs, or access control lists until patching is complete.
Monitor outbound connections for anomalies, particularly attempts to reach 176.65.148.184 or the use of tools such as nc and unexpected bash invocations from web services.
Inspect logs for signs of post-exploitation and rotate all associated credentials if compromise is suspected.

Additional technical details are available from The Hacker News and Horizon3.ai research reports, as well as official Sangoma release notes.

PostgreSQL Sangoma Switchvox CVE-2026-9586 CWE-89

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