Threat Intelligence / CVE / CVE-2026-54782

CVE-2026-54782

CVSS 10 (CRITICAL) · EPSS 0.2% · Priority 5.6/10 · Published 2026-07-08

As of 2026-07-10, CVE-2026-54782 is a CVSS 10 (CRITICAL-severity) vulnerability. EPSS exploitation probability 0.2%. Threadlinqs Intelligence tracks 0 threats exploiting it.

Last updated: 2026-07-10

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.

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Weaknesses (CWE)

CWE-290, CWE-347

Affected packages

nuget:CoreWCF.Primitives — patched in 1.8.1
nuget:CoreWCF.Primitives — patched in 1.9.1

References

Full detection coverage & IOCs for threats exploiting CVE-2026-54782 are available via the Threadlinqs MCP server (Purple tier). View plans →

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.