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CVE-2026-54782

CRITICAL
10.0
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 1.1 and SAML 2.0 token validation does not correctly resolve the issuer signing key or require signed tokens when IdentityConfiguration is used with federated bindings, allowing an unauthenticated remote attacker to impersonate any principal the trusted STS could issue. This issue is fixed in versions 1.8.1 and 1.9.1.

Metadata

CVE ID
CVE-2026-54782
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-15 23:23 UTC
Published
2026-07-08 22:20 UTC
Last updated
2026-07-09 14:28 UTC
Primary CWE
CWE-290
CWE-290: Authentication Bypass by Spoofing
Vendor / Product
CoreWCF / CoreWCF
Sources
cve.org  ·  NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
CoreWCF CoreWCF — >= 1.9.0, < 1.9.1, < 1.8.1
Weakness (CWE)
CWESourceDescription
CWE-290 cna CWE-290: Authentication Bypass by Spoofing
CWE-347 cna CWE-347: Improper Verification of Cryptographic Signature
CVSS scores (1)
ScoreSeverityVersionSourceVector
10.0 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
References (6)
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