← Vulnerability feed

Vulnerability record · CVE-2026-33566 · published 27 April 2026

CVE-2026-33566: Jpcert logontracer vulnerability

Jpcert · Logontracer

There is a cypher injection issue in LogonTracer prior to v2.0.0. If specially crafted Windows event log data is loaded, the contents of the database may be altered.

5.1 CVSS 4.0 Medium EPSS 0.30% · top 79.2% CWE-943 · CWE-943
5.1CVSS 4.0 base score
0.30%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

There is a cypher injection issue in LogonTracer prior to v2.0.0. If specially crafted Windows event log data is loaded, the contents of the database may be altered.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jvn.jp/en/jp/JVN57877356/ Third Party Advisory
https://www.jpcert.or.jp/press/2026/PR20260423.html Third Party Advisory

Track CVE-2026-33566 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-16167LogonTracer OS command injection via unspecified vectorsLogonTracer 1.2.0 and earlier contains an OS command injection flaw (CWE-78) that lets remote attackers run arbitrary operating system commands. The …EPSS 75%analysed9.8CVE-2018-16168Jpcert logontracer code injection vulnerabilityLogonTracer 1.2.0 and earlier allows remote attackers to conduct Python code injection attacks via unspecified vectors.EPSS 2.4%8.8CVE-2018-16166Jpcert logontracer xml external entity (xxe) vulnerabilityLogonTracer 1.2.0 and earlier allows remote attackers to conduct XML External Entity (XXE) attacks via unspecified vectors.EPSS 1.9%8.7CVE-2026-33277Jpcert logontracer os command injection vulnerabilityAn OS command Injection issue exists in LogonTracer prior to v2.0.0. An arbitrary OS command may be executed by a logged-in user.EPSS 2.3%6.1CVE-2018-16165Jpcert logontracer cross-site scripting vulnerabilityCross-site scripting vulnerability in LogonTracer 1.2.0 and earlier allows remote attackers to inject arbitrary web script or HTML via unspecified ve…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2026-33566), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.