{"action":"Upgrade Sustainsys.Saml2 to 2.5.0 or later.","affected":[{"fixed":"2.5.0","introduced":"2.0.0"}],"component":"Sustainsys.Saml2","cve_ids":["CVE-2020-5261"],"ecosystem":"NuGet","epss":0.01496,"exploited":false,"fixed_versions":["2.5.0"],"ghsa_id":"GHSA-g6j2-ch25-5mmv","id":"tcs_01M5N8NWAKNQ9TTMHV3YGVCBWB","modified_at":"2026-07-08T05:59:58.863877488Z","published_at":"2020-03-25T16:52:49Z","references":["https://osv.dev/vulnerability/GHSA-g6j2-ch25-5mmv","https://github.com/Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv","https://nvd.nist.gov/vuln/detail/CVE-2020-5261","https://github.com/Sustainsys/Saml2/issues/711","https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241"],"severity":{"label":"high","score":8.2},"sources":[{"source":"osv","source_id":"GHSA-g6j2-ch25-5mmv","url":"https://osv.dev/vulnerability/GHSA-g6j2-ch25-5mmv"}],"summary":"Missing Token Replay Detection in Saml2 Authentication services for ASP.NET"}