CVE-2026-12219 | Yealink SIP-T46U 108.86.0.118 Web FastCGI Service /api/diagnosis/start mod_diagnose.CommandShellByType Time command injection

A vulnerability, which was classified as critical, has been found in Yealink SIP-T46U 108.86.0.118. The impacted element is the function mod_diagnose.CommandShellByType of the file /api/diagnosis/start of the component Web FastCGI Service. This manipulation of the argument Time causes command injection.

This vulnerability is handled as CVE-2026-12219. The attack can be initiated remotely. Additionally, an exploit exists.

The vendor was contacted early about this disclosure but did not respond in any way.