What is CVE-2026-12223?

CVE-2026-12223 is a medium-severity vulnerability in Yealink Sip-T46u, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.5/10. Published 2026-06-15.

How severe is CVE-2026-12223?

Medium severity. CVSS v3 base score is 5.5 out of 10.

RCE in Yealink Sip-T46u

CVE-2026-12223

A vulnerability was identified in Yealink SIP-T46U 108.86.0.118. Affected by this vulnerability is the function mod_webd.TFTPUploadIperf of the file /api/inner/tftpuploadiperf of the component Web FastCGI Service. The manipulation of the argument ip/port leads to command injection. The attack needs to be initiated within the local network. The exploit is publicly available and might be used. Upgrading to version 108.87.0.23 addresses this issue. Upgrading the affected component is recommended. The vendor explains: "It has been fixed (...) for our technical support branch. However, please note that this specific support branch firmware is not publicly released yet."

EPSS: 0.012 (66.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Yealink Sip-t46u — versions 108.86.0.118, 108.87.0.23

Weakness classification (CWE)

References

cna@vuldb.com (exploit, broken-link)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)

Frequently asked questions

What is CVE-2026-12223?: CVE-2026-12223 is a medium-severity vulnerability in Yealink Sip-T46u, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.5/10. Published 2026-06-15.
How severe is CVE-2026-12223?: Medium severity. CVSS v3 base score is 5.5 out of 10.