# CVE-2026-8398

## Summary

- **CVE ID:** CVE-2026-8398
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-506
- **Published:** May 15, 2026
- **Last Modified:** May 28, 2026

## Description

A supply chain attack compromised the official installation packages of DAEMON Tools Lite (Windows versions 12.5.0.2421 through 12.5.0.2434), distributed from the legitimate website daemon-tools.cc between approximately April 8, 2026, and May 5, 2026. Attackers gained unauthorized access to the vendor's (AVB Disc Soft) build or distribution infrastructure and trojanized three binaries: DTHelper.exe, DiscSoftBusServiceLite.exe, and DTShellHlp.exe. These files were digitally signed with the legitimate AVB Disc Soft code-signing certificate, allowing the malicious installers to appear trustworthy and bypass signature-based detection.

## Affected Products

- AVB Disc Soft — DAEMON Tools Lite (12.5.0.2421)

## References

- [CNA](https://securelist.com/tr/daemon-tools-backdoor/119654/)
- [CNA](https://blog.daemon-tools.cc/post/security-incident)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-8398)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.46%
- **EPSS Percentile:** 71.9

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** May 27, 2026
- **Due Date:** May 30, 2026

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._