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CVE-2026-54774

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, SamlSerializer skips final SignatureValue verification when a CoreWCF service validates SAML tokens using a non-X.509 signing token, allowing an attacker to reference a non-X.509 SecurityToken key identifier and bypass assertion signature verification. This issue is fixed in versions 1.8.1 and 1.9.1.

Metadata

CVE ID
CVE-2026-54774
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-15 23:23 UTC
Published
2026-07-08 22:17 UTC
Last updated
2026-07-09 14:40 UTC
Primary CWE
CWE-345
CWE-345: Insufficient Verification of Data Authenticity
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
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
CoreWCF CoreWCF — >= 1.9.0, < 1.9.1, < 1.8.1
Weakness (CWE)
CWESourceDescription
CWE-345 cna CWE-345: Insufficient Verification of Data Authenticity
CWE-347 cna CWE-347: Improper Verification of Cryptographic Signature
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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