# CVE-2026-12223: Yealink SIP-T46U Web FastCGI Service tftpuploadiperf mod_webd.TFTPUploadIperf command injection

> A command injection vulnerability in the Yealink SIP-T46U web service allows local network attackers to execute arbitrary commands via the TFTP upload interface.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Jun 2026
- **Updated:** 27 Jun 2026
- **Also known as:** GHSA-pcph-rxv7-4pvp

## What is CVE-2026-12223?

CVE-2026-12223 is a medium-severity command injection vulnerability in Yealink SIP-T46U, published on 15 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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."

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-12223?


## How do I fix CVE-2026-12223?

No fix has been published for CVE-2026-12223 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12223 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12223 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12223 and fix it if it is affected.

What it is: CVE-2026-12223 is a medium-severity command injection vulnerability in Yealink SIP-T46U, published on 15 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12223 exists.

Affected product: Yealink SIP-T46U. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-12223/ (Markdown: https://insights.sbomify.com/CVE-2026-12223/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12223
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12223
- OSV: https://osv.dev/vulnerability/CVE-2026-12223

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12223/
Summaries are generated and may contain mistakes; the official description above is the record.