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CVE Vulnerability Details :
CVE-2026-54774
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-08 Jul, 2026 | 22:17
Updated At-10 Jul, 2026 | 03:55
Rejected At-
▼CVE Numbering Authority (CNA)
CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

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.

Affected Products
Vendor
CoreWCF
Product
CoreWCF
Versions
Affected
  • >= 1.9.0, < 1.9.1
  • < 1.8.1
Problem Types
TypeCWE IDDescription
CWECWE-345CWE-345: Insufficient Verification of Data Authenticity
CWECWE-347CWE-347: Improper Verification of Cryptographic Signature
Type: CWE
CWE ID: CWE-345
Description: CWE-345: Insufficient Verification of Data Authenticity
Type: CWE
CWE ID: CWE-347
Description: CWE-347: Improper Verification of Cryptographic Signature
Metrics
VersionBase scoreBase severityVector
3.17.4HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Version: 3.1
Base score: 7.4
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9
x_refsource_CONFIRM
https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8
x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4
x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b
x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1
x_refsource_MISC
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1
x_refsource_MISC
Hyperlink: https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8
Resource:
x_refsource_MISC
Hyperlink: https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4
Resource:
x_refsource_MISC
Hyperlink: https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b
Resource:
x_refsource_MISC
Hyperlink: https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1
Resource:
x_refsource_MISC
Hyperlink: https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found