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CVE-2026-8398

Published: May 15, 2026Updated: May 28, 2026 Sources: CVE List NVD BDUCWE-506
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.8%
Top 49.8%
CISA KEV
Active Exploitation
Since May 27, 2026
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-506

Affected Products

DAEMON Tools LiteAVB Disc Soft
daemon toolsdisc-soft
On-prem
Consumer Software / file-utility
DAEMON Tools LiteDisc Soft Ltd.
On-prem
Consumer Software / file-utility
disc-softcommercialConsumer Software
disc soft ltd.commercialConsumer Softwareaka daemon tools lite, daemon tools

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:May 27, 2026
Remediation due:May 30, 2026

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Official Patch Available

References

https://securelist.com/tr/daemon-tools-backdoor/119654/
securelist.com
https://blog.daemon-tools.cc/post/security-incident
blog.daemon-tools.cc
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-8398
cisa.gov
and 5 more references View all →

Timeline

Published
May 15, 2026
Added to CISA KEV
May 27, 2026
Last Updated
May 28, 2026
News mentions
2

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