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CVE-2026-54781

HIGH
7.4
CVSS 3.1
Description
CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF SAML token validation does not enforce SubjectConfirmation method URIs or holder-of-key proof keys in SamlSecurityTokenHandler, allowing holder-of-key downgrade or custom confirmation method assertions to authenticate a subject without proving authority over the assertion. This issue is fixed in versions 1.8.1 and 1.9.1.

Metadata

CVE ID
CVE-2026-54781
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-15 23:23 UTC
Published
2026-07-08 22:19 UTC
Last updated
2026-07-08 22:19 UTC
Primary CWE
CWE-287
CWE-287: Improper Authentication
Vendor / Product
CoreWCF / CoreWCF
Sources
cve.org  ·  NVD

Severity & Metrics

7.4 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products (1)
VendorProductPlatformVersions
CoreWCF CoreWCF — >= 1.9.0, < 1.9.1, < 1.8.1
Weakness (CWE)
CWESourceDescription
CWE-287 cna CWE-287: Improper Authentication
CWE-345 cna CWE-345: Insufficient Verification of Data Authenticity
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.4 HIGH 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
References (6)
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