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CVE-2026-12219 Yealink CVE debrief

A command injection vulnerability has been discovered in Yealink SIP-T46U 108.86.0.118, specifically in the mod_diagnose.CommandShellByType function of the /api/diagnosis/start endpoint, part of the Web FastCGI Service. This vulnerability allows remote attackers to inject commands by manipulating the Time argument. The vulnerability has been publicly disclosed and an exploit is available. The CVSS score for this vulnerability is 2.1, indicating a low severity.

Vendor
Yealink
Product
SIP-T46U
CVSS
LOW 2.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-06-27
Advisory published
2026-06-15
Advisory updated
2026-06-27

Who should care

Administrators and users of Yealink SIP-T46U 108.86.0.118 are advised to take immediate action to mitigate this vulnerability.

Technical summary

The vulnerability exists in the mod_diagnose.CommandShellByType function of the /api/diagnosis/start endpoint. An attacker can inject commands by manipulating the Time argument, allowing for remote command injection.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by the vendor to fix the vulnerability.
  • Restrict access to the /api/diagnosis/start endpoint to trusted IP addresses or networks.
  • Monitor system logs for suspicious activity related to the Web FastCGI Service.

Evidence notes

The vulnerability was discovered and publicly disclosed on June 15, 2026. The vendor was contacted but did not respond.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12219 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12219

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-12219 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12219

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.