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.
Severity (CVSS)
| Base score | 10 |
|---|---|
| Severity | Critical |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
| Provided by | CNA |
Weaknesses
- CWE-290 — CWE-290: Authentication Bypass by Spoofing
- CWE-347 — CWE-347: Improper Verification of Cryptographic Signature
Affected products
| Vendor | Product | Versions |
|---|---|---|
| CoreWCF | CoreWCF | >= 1.9.0, < 1.9.1; < 1.8.1 |
References
- https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-xjr9-gg9q-jx3v (x_refsource_CONFIRM)
- https://github.com/CoreWCF/CoreWCF/commit/0b8c8af851260e85e8402af53233d1b8f87dfb6f (x_refsource_MISC)
- https://github.com/CoreWCF/CoreWCF/commit/0e63c2cca55763d8be6b226a234579280a09e7b6 (x_refsource_MISC)
- https://github.com/CoreWCF/CoreWCF/commit/e5cc9b6a4ecc102a50d782093bfc72e0790abe3d (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)
Generated from the official CVE List on 09 Jul 2026 07:08 UTC.