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 Computer field. An attacker can inject JavaScript into the Computer field of JSON logs that executes in the forensic examiner's browser session when viewing the generated HTML report, leading to information disclosure or code execution.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (26.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Yamato-Security Hayabusa — versions 0, 3.8.0
Weakness classification (CWE)
References
- github.com/Yamato-Security/hayabusa/releases/tag/v3.8.0 (product, Release Notes)
- mobasi.ai/sentinel (vendor-advisory, Third Party Advisory)
- www.vulncheck.com/advisories/hayabusa-xss-via-json-log-import (Third Party Advisory, 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.