Is CVE-2026-54784 in the CISA KEV catalog?

No. CVE-2026-54784 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-54784?

CVE-2026-54784 has a CVSS v3 base score of 7.4 (HIGH).

What is the EPSS score for CVE-2026-54784?

CVE-2026-54784 has an EPSS score of 0.18% (7th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-54784?

No published fix for CVE-2026-54784 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-54784

HIGH

7.4

CVSS v3

NVD

Description

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. In version 1.9.0, CoreWCF SPNEGO SecurityContextToken negotiation can expose the proof key recovered from the RSTR when TransportWithMessageCredential with Windows client credentials and session establishment are used, allowing an observer to impersonate the authenticated Windows principal and decrypt or forge WS-SecureConversation traffic. This issue is fixed in version 1.9.1.

CWE-311 CWE-523

How to fix

No published remediation has been found for this vulnerability's affected products yet.

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.18%probability of exploitation in 30 days

7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Other references4

Related Vulnerabilities

Other CWE-311 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-27944	Critical	9.8	22%	-	Fix
CVE-2026-34486	High	7.5	22%	-	Fix
CVE-2019-11367	Critical	9.8	2.8%	-	Fix
CVE-2017-8221	High	7.5	2.7%	-	-
CVE-2016-10593	High	8.1	2.3%	-	-
CVE-2018-10698	Critical	9.8	2.3%	-	-

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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 2026-07-10.