What is CVE-2026-40028?

CVE-2026-40028 is a medium-severity vulnerability in Yamato-security Hayabusa, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-08.

How severe is CVE-2026-40028?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Yamato-security Hayabusa

CVE-2026-40028

Hayabusa versions prior to 3.8.0 contain a cross-site scripting (XSS) vulnerability in its HTML report output that allows an attacker to execute arbitrary JavaScript when a user scans JSON-exported logs containing malicious content in the…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (10.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Yamato-security Hayabusa — versions 0, 3.8.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Release Notes (product)
Mobasi Sentinel Vulnerability Index (vendor-advisory)
VulnCheck Advisory: Hayabusa < 3.8.0 XSS via JSON Log Import (third-party-advisory)

Frequently asked questions

What is CVE-2026-40028?: CVE-2026-40028 is a medium-severity vulnerability in Yamato-security Hayabusa, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-08.
How severe is CVE-2026-40028?: Medium severity. CVSS v3 base score is 5.4 out of 10.