CVE-2026-54773: CoreWCF: WS-Security signature substitution via document-wide Signature lookup

June 19, 2026

An unauthenticated remote attacker who can place a SOAP header lexically before wsse:Security can embed a ds:Signature of their choosing inside that header and cause the server to verify the attacker-supplied signature instead of the one carried in the security header.

References

github.com/CoreWCF/CoreWCF/security/advisories/GHSA-jc6x-rj79-w4mx
github.com/advisories/GHSA-jc6x-rj79-w4mx
nvd.nist.gov/vuln/detail/CVE-2026-54773

Code Behaviors & Features

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