CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

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Summary

CVECVE-2026-54774
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 23:16:55 UTC
Updated2026-07-10 05:16:37 UTC
DescriptionCoreWCF 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

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

EPSS: 0.001500000 probability, percentile 0.046150000 (date 2026-07-12)

Problem Types: CWE-345 | CWE-347 | CWE-345 CWE-345: Insufficient Verification of Data Authenticity | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CoreWCF CoreWCF affected >= 1.9.0, < 1.9.1 Not specified
CNA CoreWCF CoreWCF affected < 1.8.1 Not specified

References

ReferenceSourceLinkTags
github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4 [email protected] github.com
github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9 [email protected] github.com
github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 [email protected] github.com
github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8 [email protected] github.com
github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b [email protected] github.com
github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 [email protected] github.com
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