# CVE-2026-23767: Missing authorization in ESC/POS

> ESC/POS protocol lacks authentication and encryption, allowing attackers to execute arbitrary commands or modify data on compatible printers.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Mar 2026
- **Updated:** 6 Mar 2026
- **Also known as:** GHSA-57q8-p4r4-7xr7

## What is CVE-2026-23767?

CVE-2026-23767 is a critical missing authorization vulnerability in Seiko Epson Corporation ESC/POS, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ESC/POS, a printer control language designed by Seiko Epson Corporation, lacks mechanisms for user authentication and command authorization, does not provide controls to restrict sources or destinations of network communication, and transmits commands without encryption or integrity protection.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-23767?

It affects 24 products.


Products: Epson Sb-H50 Firmware, Epson Tm-H6000v Firmware, Epson Tm-L100 Firmware, Epson Tm-M10 Firmware, Epson Tm-M30 Firmware, Epson Tm-M30ii-H Firmware, Epson Tm-M30ii-S Firmware, Epson Tm-M30ii-Sl Firmware, Epson Tm-M30ii Firmware, Epson Tm-M30iii-H Firmware, Epson Tm-M30iii Firmware, Epson Tm-M55 Firmware, Epson Tm-P20 Firmware, Epson Tm-P20ii Firmware, Epson Tm-P60ii Firmware, Epson Tm-P80 Firmware, Epson Tm-P80ii Firmware, Epson Tm-T20ii Firmware, Epson Tm-T20iii Firmware, Epson Tm-T88vi-Ihub Firmware and 4 more.

## How do I fix CVE-2026-23767?

No fix has been published for CVE-2026-23767 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23767 being exploited?

There is no known exploitation of CVE-2026-23767 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23767 and fix it if it is affected.

What it is: CVE-2026-23767 is a critical missing authorization vulnerability in Seiko Epson Corporation ESC/POS, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-23767 in the wild and no public exploit code.

Affected product: Seiko Epson Corporation ESC/POS. 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-2026-23767/ (Markdown: https://insights.sbomify.com/CVE-2026-23767/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23767
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23767
- OSV: https://osv.dev/vulnerability/CVE-2026-23767

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23767/
Summaries are generated and may contain mistakes; the official description above is the record.