RCE in Japan Computer Emergency Response Team Coordination Center (Jpcert/cc) Logontracer

CVE-2026-33277

An OS command Injection issue exists in LogonTracer prior to v2.0.0. An arbitrary OS command may be executed by a logged-in user.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.004 (59.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Japan Computer Emergency Response Team Coordination Center (Jpcert/cc) Logontracer — versions prior to v2.0.0
Jpcert Logontracer

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

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

Frequently asked questions

What is CVE-2026-33277?: CVE-2026-33277 is a high-severity vulnerability in Japan Computer Emergency Response Team Coordination Center (Jpcert/cc) Logontracer, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-04-27.
How severe is CVE-2026-33277?: High severity. CVSS v3 base score is 8.8 out of 10.