CVE-2026-9588: Sangoma Switchvox SMB Edition

High severity, CVSS 7.0. EPSS: 0.4% chance of exploitation in the next 30 days.

A stored cross-site scripting (XSS) vulnerability exists in Sangoma Switchvox SMB Edition 8.3 (104997) within the voicemail notification template functionality. The submit_modify_voicemail_template endpoint fails to properly sanitize HTML content supplied by authenticated users, allowing malicious JavaScript supplied through the template_text parameter to be stored server-side and subsequently rendered to other users.

Affected products

• Sangoma Switchvox SMB Edition: from 8.3 (104997), before 8.4.0.2 (fixed in 8.4.0.2)

Published 2026-07-17. Last modified 2026-07-17.