Is CVE-2026-8398 in the CISA KEV catalog?

Yes. CVE-2026-8398 is on the CISA Known Exploited Vulnerabilities list, added 2026-05-27.

What is the CVSS severity of CVE-2026-8398?

CVE-2026-8398 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2026-8398?

CVE-2026-8398 has an EPSS score of 1.46% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-8398?

No published fix for CVE-2026-8398 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2026-05-30. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2026-8398

CRITICALCISA KEVEPSS 71th pctl

9.8

CVSS v3

NVD

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.

CWE-506

How to fix

Actively exploited, no published fix found yet

Federal remediation due: 2026-05-30

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.46%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-05-30

References

Exploit1

securelist.com

Vendor Advisory1

blog.daemon-tools.cc

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-506 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3094	Critical	10.0	86%	-	Fix
CVE-2026-33634	High	8.8	60%	KEV	Fix
CVE-2025-30066	High	8.6	41%	KEV	-
CVE-2024-4978	High	8.4	27%	KEV	-
CVE-2025-54313	High	7.5	4.1%	KEV	Fix
CVE-2026-45321	Critical	9.6	2.3%	KEV + Ransom	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-28.