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CVE-2026-54782
10.0 CRITICAL
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Changed (C)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): High (H)
- Modified Scope (MS): Changed (C)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): None (N)
Activity log
- Created & dismissed (no matching packages found) suggestion
CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation
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.
References
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https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-xjr9-gg9q-jx3v x_refsource_CONFIRM
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https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 x_refsource_MISC
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https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 x_refsource_MISC
Affected products
CoreWCF
- ==< 1.8.1
- ==>= 1.9.0, < 1.9.1