CVE-2026-9588 Authenticated Stored Cross-Site Scripting (XSS) in Switchvox SMB Web Portal
Authenticated attackers can inject malicious JavaScript into voicemail templates, leading to stored XSS and potential account takeover for other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-9588?
CVE-2026-9588 is a high-severity cross-site scripting vulnerability in Sangoma Switchvox SMB Edition, published on 17 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-9588?
How do I fix CVE-2026-9588?
No fix has been published for CVE-2026-9588 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-9588 being exploited?
There is no known exploitation of CVE-2026-9588 in the wild and no public exploit code.
Sources
Also known as GHSA-xrh4-q49w-whmw.