CVE-2026-54782: CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation

June 19, 2026

Full impersonation of any principal the trusted STS could have issued an assertion for — including administrative principals when the relying party grants them via SAML claims. Affects both SAML 1.1 and SAML 2.0.

References

github.com/CoreWCF/CoreWCF/security/advisories/GHSA-xjr9-gg9q-jx3v
github.com/advisories/GHSA-xjr9-gg9q-jx3v
nvd.nist.gov/vuln/detail/CVE-2026-54782

Code Behaviors & Features

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