CVE-2026-55113 in UniFi Talk Application
A malicious actor with access to the network could exploit a Server-Side Request Forgery (SSRF) vulnerability found in UniFi Talk Application to execute a Denial of Service (DoS) attack and bypass authentication in certain UniFi Talk API endpoints.
Quick answer
Ubiquiti UniFi Talk Application should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- UniFi Talk Application before 5.2.2
Fixed versions
- UniFi Talk Application 5.2.2 or later
How to fix it
CVE-2026-55113 affects UniFi Talk Application. The issue means SSRF may cause denial of service and bypass some API authentication checks. Treat this as a priority if the system is reachable by users, tenants, or the network. Update to UniFi Talk Application 5.2.2 or later, or follow the vendor advisory if your branch needs a backport.
- Inventory every UniFi Talk Application instance, appliance, container, or package in use.
- Compare installed versions with the affected ranges in the vendor advisory.
- Update to UniFi Talk Application 5.2.2 or later on supported systems.
- If you cannot update today, restrict access to trusted admins and trusted networks only.
- Review logs for unusual access, privilege changes, file access, or failed requests.
- Rotate secrets, tokens, and service accounts if exposure or abuse is suspected.
- Document the change and keep the advisory link with the ticket.
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Verify the fix
- Confirm the installed version is UniFi Talk Application 5.2.2 or later.
- Confirm exposed admin, API, SFTP, or device access is limited to trusted users.
- Retest the affected workflow after the update or mitigation.
- Review logs again after patching for repeated suspicious activity.
- Run a new Fixnx scan where the affected service is part of the public site.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-55113?
Ubiquiti UniFi Talk Application versions listed as affected should be reviewed: UniFi Talk Application before 5.2.2.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.