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

Detect and mitigate CVE-2026-54782 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →