CVE-2026-23767
Auth bypass in ESC/POS printers allows unauthenticated command injection.
Is CVE-2026-23767 being exploited?
Not confirmed. CVE-2026-23767 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-23767?
CVE-2026-23767 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-23767?
Yes. A fix has been recorded for CVE-2026-23767. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-23767 affect?
CVE-2026-23767 affects Seiko Epson ESC/POS printers, POS printers and devices supporting ESC/POS. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-23767?
Restrict printer network access; enable firmware updates; monitor for unusual printer activity.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Auth bypass enables unauthorized commands to ESC/POS printers; unencrypted traffic risks tampering, data exposure, or DoS.
Patch when possible
- affectedAll products implementing ESC/POS
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.