{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/52423?format=json","vulnerability_id":"VCID-pbyw-b4bw-uuhk","summary":"Authentication Bypass by Capture-replay\nSaml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) has a faulty implementation of Token Replay Detection. Token Replay Detection is an important defence in depth measure for Single Sign On solutions.","aliases":[{"alias":"CVE-2020-5261"},{"alias":"GHSA-g6j2-ch25-5mmv"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/76965?format=json","purl":"pkg:nuget/Sustainsys.Saml2@2.5.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-caea-y5bm-zked"},{"vulnerability":"VCID-v3bx-f3um-8ubc"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@2.5.0"}],"affected_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/67058?format=json","purl":"pkg:nuget/Sustainsys.Saml2@2.0.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-caea-y5bm-zked"},{"vulnerability":"VCID-pbyw-b4bw-uuhk"},{"vulnerability":"VCID-v3bx-f3um-8ubc"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@2.0.0"},{"url":"http://public2.vulnerablecode.io/api/packages/250893?format=json","purl":"pkg:nuget/Sustainsys.Saml2@2.1.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-caea-y5bm-zked"},{"vulnerability":"VCID-pbyw-b4bw-uuhk"},{"vulnerability":"VCID-v3bx-f3um-8ubc"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@2.1.0"},{"url":"http://public2.vulnerablecode.io/api/packages/250894?format=json","purl":"pkg:nuget/Sustainsys.Saml2@2.2.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-caea-y5bm-zked"},{"vulnerability":"VCID-pbyw-b4bw-uuhk"},{"vulnerability":"VCID-v3bx-f3um-8ubc"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@2.2.0"},{"url":"http://public2.vulnerablecode.io/api/packages/250895?format=json","purl":"pkg:nuget/Sustainsys.Saml2@2.3.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-caea-y5bm-zked"},{"vulnerability":"VCID-pbyw-b4bw-uuhk"},{"vulnerability":"VCID-v3bx-f3um-8ubc"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@2.3.0"},{"url":"http://public2.vulnerablecode.io/api/packages/250896?format=json","purl":"pkg:nuget/Sustainsys.Saml2@2.4.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-caea-y5bm-zked"},{"vulnerability":"VCID-pbyw-b4bw-uuhk"},{"vulnerability":"VCID-v3bx-f3um-8ubc"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@2.4.0"}],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-5261","reference_id":"","reference_type":"","scores":[{"value":"0.00285","scoring_system":"epss","scoring_elements":"0.52246","published_at":"2026-06-04T12:55:00Z"},{"value":"0.00285","scoring_system":"epss","scoring_elements":"0.52264","published_at":"2026-06-08T12:55:00Z"},{"value":"0.00285","scoring_system":"epss","scoring_elements":"0.52293","published_at":"2026-06-07T12:55:00Z"},{"value":"0.00285","scoring_system":"epss","scoring_elements":"0.52313","published_at":"2026-06-06T12:55:00Z"},{"value":"0.00285","scoring_system":"epss","scoring_elements":"0.52305","published_at":"2026-06-05T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-5261"},{"reference_url":"https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241"},{"reference_url":"https://github.com/Sustainsys/Saml2/issues/711","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/Sustainsys/Saml2/issues/711"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5261","reference_id":"CVE-2020-5261","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5261"},{"reference_url":"https://github.com/advisories/GHSA-g6j2-ch25-5mmv","reference_id":"GHSA-g6j2-ch25-5mmv","reference_type":"","scores":[{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-g6j2-ch25-5mmv"},{"reference_url":"https://github.com/Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv","reference_id":"GHSA-g6j2-ch25-5mmv","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/Sustainsys/Sam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