CVE-2026-19745: Calix GigaSpire Web Management utilities_configurationsave.cgi denial of service

A flaw has been found in Calix GigaSpire 26.1.0. Impacted is an unknown function of the file utilitiesconfigurationsave.cgi of the component Web Management Interface. Executing a manipulation of the argument sessionKey can lead to denial of service. The attack can be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.