CVE-2026-12219 Yealink SIP-T46U Web FastCGI Service start mod_diagnose.CommandShellByType command injection
Remote attackers can execute arbitrary commands on Yealink SIP-T46U phones via the Web FastCGI service, requiring a firmware upgrade.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12219?
CVE-2026-12219 is a medium-severity command injection vulnerability in Yealink SIP-T46U, published on 15 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw 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. The attack can be initiated remotely. The exploit has been published and may be used. Upgrading to version 108.87.0.23 is sufficient to resolve this issue. It is advisable to upgrade the affected component.
Which versions are affected by CVE-2026-12219?
How do I fix CVE-2026-12219?
No fix has been published for CVE-2026-12219 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-12219 being exploited?
There is no known exploitation of CVE-2026-12219 in the wild and no public exploit code.
Sources
Also known as GHSA-85r6-756v-4x2v.