CVEvulnerability

CVE-2026-54782

10.0 CRITICAL Published 2026-07-08 Modified 2026-07-10 Official page ↗

Status: Deferred
Published: 2026-07-08
Last modified: 2026-07-10
Assigner: [email protected]
CVSS 3.1 ([email protected]): 10.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Weaknesses: CWE-290, CWE-347

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.

Weakness · CWE (2)

CWE-290 Authentication Bypass by Spoofing weakness
CWE-347 Improper Verification of Cryptographic Signature weakness

References

https://github.com/CoreWCF/CoreWCF/commit/0b8c8af851260e85e8402af53233d1b8f87dfb6f github.com
https://github.com/CoreWCF/CoreWCF/commit/0e63c2cca55763d8be6b226a234579280a09e7b6 github.com
https://github.com/CoreWCF/CoreWCF/commit/e5cc9b6a4ecc102a50d782093bfc72e0790abe3d github.com
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 github.com
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 github.com
https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-xjr9-gg9q-jx3v github.com

CVE-2026-54782

Description

Related

Weakness · CWE (2)

References