Attestkeep
Language: English
Sign up

Vulnerabilities / CVE-2026-54782

critical

CVE-2026-54782

CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation

Published Modified CWE 290, 347
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

GHSA10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by GHSA.

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.

Affected packages and fixed versions

SourcePackageFixed in
nuget::GitHub Security Advisory NuGetCoreWCF.Primitives, corewcf.primitives1.8.1, 1.9.1
Show all 2 entries from 1 source
SourcePackageFixed in
nuget::GitHub Security Advisory NuGetCoreWCF.Primitives1.8.1, 1.9.1
nuget::GitHub Security Advisory NuGetcorewcf.primitives1.8.1, 1.9.1

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.