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

Published 2026-03-05 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.004 (36.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

www.epson.jp/support/misc_t/260305_oshirase.htm (Vendor Advisory)
download4.epson.biz/sec_pubs/bs/pdf/IP_Filtering_Guide_en_revA.pdf (Product)
jvn.jp/en/ta/JVNTA97995322/ (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.