Attackers Exploit Critical Switchvox Flaw to Deploy Reverse Shells Without Credentials
Attackers exploit unauthenticated SQL injection CVE-2026-9586 in Sangoma Switchvox to run PostgreSQL commands and deploy reverse shells.
Threat actors are exploiting CVE-2026-9586 (CVSS 9.3), an unauthenticated SQL injection in Sangoma Switchvox SMB Edition 8.3 (104997), since August 30, 2026, running arbitrary SQL as the PostgreSQL superuser and achieving remote code execution. The /pa endpoint concatenates the user-controlled PhoneIP value into PostgreSQL queries; attackers can extract database contents, escalate to Switchvox web administrator, exfiltrate the cookie signing key to forge authentication, and invoke reverse shells. Sangoma patched the flaw in Switchvox 8.4.0.2 on July 14, 2026, roughly 4,000 instances are internet-exposed (mostly in the US), and honeypot activity from IP 176.65.148.184 deploys reverse shells followed by Base64-encoded process enumeration.
- CVE-2026-9586 is an unauthenticated SQL injection enabling code execution as PostgreSQL superuser
- Patched July 14, 2026 in Switchvox 8.4.0.2; ~4,000 instances remain internet-exposed, mostly US
- Horizon3.ai reported it among 12 Switchvox vulnerabilities; SRA Labs independently found and weaponized it
- Observed activity: reverse shells, Base64-encoded command execution, cookie signing key exfiltration
- Attacker IP 176.65.148.184 seen across multiple honeypots, likely scanning exposed instances
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-9586 | Unauthenticated SQL Injection RCE in Sangoma Switchvox SMB Edition Sangoma Switchvox SMB Edition 8.3 (build 104997) contains an unauthenticated SQL injection flaw (CWE-89) in its /pa endpoint, where the user-controlled PhoneIP value from XML input is concatenated directly into PostgreSQL queries without sanitization or parameterization. A single crafted request lets a remote, unauthenticated attacker execute arbitrary SQL statements against the backend PostgreSQL database, which can be escalated to remote code execution on the server. Any organization running the affected Switchvox SMB Edition build is exposed, especially appliances reachable from the internet. Exploitation is confirmed in the wild: the flaw was added to CISA's KEV catalog on 2026-09-02, and researchers have observed attackers using it without credentials to deploy reverse shells and cryptocurrency miners. Do: Identify all Switchvox SMB Edition deployments and verify the running build (affected: 8.3, build 104997), then upgrade to the patched release specified in Sangoma's advisory. If patching is delayed, restrict or remove internet exposure of the Switchvox web interface, including the /pa endpoint. Hunt for indicators of compromise such as unexpected reverse shells, new processes, or crypto-miner activity, as active exploitation is confirmed and the flaw is on CISA's KEV catalog, making it subject to BOD 26-04 patching guidance for federal stakeholders. | 9.3 | 12% | KEV PoC |
| moderatelikely on the order of thousands of on-prem PBX deployments (est.) |
Full article446 words · extracted from thehackernews.com · click to collapse
Ravie LakshmananSep 02, 2026Vulnerability / Network Security
Threat actors are exploiting a severe security vulnerability in Sangoma Switchvox, an enterprise VoIP platform, that could allow unauthenticated remote code execution.
The vulnerability in question is CVE-2026-9586 (CVSS score: 9.3), a critical unauthenticated SQL injection vulnerability in Sangoma Switchvox SMB Edition 8.3 (104997) that can allow attackers to remotely execute arbitrary code as the PostgreSQL superuser without credentials. Sangoma released patches for the flaw in Switchvox 8.4.0.2 on July 14, 2026.
"An unauthenticated SQL injection vulnerability exists in Sangoma Switchvox SMB Edition 8.3 (104997). The /pa endpoint processes XML content beginning with <PolycomIPPhone> and directly concatenates the user-controlled PhoneIP value into PostgreSQL queries without sanitization or parameterization," according to a description of the flaw on CVE.org.
"An unauthenticated remote attacker can execute arbitrary SQL statements against the backend PostgreSQL database using a single crafted request, including database operations and remote code execution."
Horizon3.ai said CVE-2026-9586 is among the 12 distinct vulnerabilities in Switchvox that were reported to Sangoma in April 2026, and that it is now seeing valid exploitation attempts in the wild against the flaw starting August 30, 2026. There are about 4,000 instances exposed to the internet, most of them located in the U.S.
The same vulnerability was independently discovered and reported by Security Risk Advisors (SRA) Labs in May.
"As an unauthenticated attacker, we were able to perform arbitrary database operations, including extracting database contents, modifying user records, and escalating privileges to Switchvox web administrators," SRA Labs said. "We also successfully executed arbitrary code on the server, invoking a reverse shell on the target machine."
In one example highlighted by SRA Labs, successful exploitation of CVE-2026-9586 makes it possible to exfiltrate the cookie signing key to an external server, thereby allowing an attacker to forge authentication material for arbitrary users.
The exploitation efforts targeting its honeypots involve the deployment of reverse shells on compromised systems, followed by running Base64-encoded commands to enumerate running processes. The autonomous penetration testing platform has shared the following indicators of compromise -
- On devices that have SSH access enabled, evidence of the SQL injection payload used can be observed in "/var/log/switchvox/db-quirks.log"
- Attacker IP address "176.65.148[.]184"
It's worth noting that the IP address has been flagged on VirusTotal for conducting port scanning, brute-force, and exploitation efforts.
"Given the quick succession of exploit attempts across multiple honeypots from the same source IP, we believe that it is likely that most internet exposed Switchvox instances will be or have already been targeted," security researcher Zach Hanley said.
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