What’s Vulnerable › Vulnerabilities

CVE-2026-9588: Authenticated Stored Cross-Site Scripting (XSS) in Switchvox SMB Web Portal

• Severity: high (CVSS 7.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-17 · updated 2026-10-24
• Weakness: CWE-79

Description

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

How to fix

Upgrade to a fixed version: Sangoma Switchvox SMB Edition 8.4.0.2. Check the vendor advisory for mitigations.

References

• https://labs.sra.io/posts/switchvox/
• https://sangomakb.atlassian.net/wiki/spaces/Switchvox/pages/1802371073/Switchvox+-+Release+Notes+Version+8.4.0.2+July+14+2026

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