High severity · published Jul 17, 2026
CVE-2026-9588
Authenticated Stored Cross-Site Scripting (XSS) in Switchvox SMB Web Portal
7.0
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SS
Switchvox SMB Edition · Sangoma
8.3 (104997) before 8.4.0.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9588
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9588
labs.sra.io
https://labs.sra.io/posts/switchvox/
sangomakb.atlassian.net
https://sangomakb.atlassian.net/wiki/spaces/Switchvox/pages/1802371073/Switchvox+-+Release+Notes+Version+8.4.0.2+July+14+2026
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