What is CVE-2026-23767?

CVE-2026-23767 is a critical-severity vulnerability in Epson Sb-H50, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-03-05.

How severe is CVE-2026-23767?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Epson Sb-H50

CVE-2026-23767

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.

Vulnerability class: Broken Authentication

EPSS: 0.004 (36.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

vultures@jpcert.or.jp (Vendor Advisory)
vultures@jpcert.or.jp (Product)
vultures@jpcert.or.jp (Third Party Advisory)

Frequently asked questions

What is CVE-2026-23767?: CVE-2026-23767 is a critical-severity vulnerability in Epson Sb-H50, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-03-05.
How severe is CVE-2026-23767?: Critical severity. CVSS v3 base score is 9.8 out of 10.