Vulnerability Instance
Lookup for vulnerabilities affecting packages.
GET /api/vulnerabilities/52534?format=api
{ "url": "http://public2.vulnerablecode.io/api/vulnerabilities/52534?format=api", "vulnerability_id": "VCID-caea-y5bm-zked", "summary": "Improper Authentication\nIn Saml2 Authentication Services for ASP.NET, and between, there is a vulnerability in how tokens are validated in some cases. Saml2 tokens are usually used as bearer tokens - a caller that presents a token is assumed to be the subject of the token. There is also support in the Saml2 protocol for issuing tokens that is tied to a subject through other means, e.g. holder-of-key where possession of a private key must be proved. The Sustainsys.Saml2 library incorrectly treats all incoming tokens as bearer tokens, even though they have another subject confirmation method specified. This could be used by an attacker that could get access to Saml2 tokens with another subject confirmation method than bearer. The attacker could then use such a token to create a log in session.", "aliases": [ { "alias": "CVE-2020-5268" }, { "alias": "GHSA-9475-xg6m-j7pw" } ], "fixed_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/77141?format=api", "purl": "pkg:nuget/Sustainsys.Saml2@1.0.2", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-v3bx-f3um-8ubc" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@1.0.2" }, { "url": "http://public2.vulnerablecode.io/api/packages/253399?format=api", "purl": "pkg:nuget/Sustainsys.Saml2@2.0.0-preview01", "is_vulnerable": false, "affected_by_vulnerabilities": [], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@2.0.0-preview01" }, { "url": "http://public2.vulnerablecode.io/api/packages/77142?format=api", "purl": "pkg:nuget/Sustainsys.Saml2@2.7.0", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-v3bx-f3um-8ubc" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:nuget/Sustainsys.Saml2@2.7.0" } ], "affected_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/253395?format=api", "purl": "pkg:nuget/Sustainsys.Saml2@0.23.0", "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@0.23.0" }, { "url": "http://public2.vulnerablecode.io/api/packages/253396?format=api", "purl": "pkg:nuget/Sustainsys.Saml2@0.24.0", "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@0.24.0" }, { "url": "http://public2.vulnerablecode.io/api/packages/253397?format=api", "purl": "pkg:nuget/Sustainsys.Saml2@1.0.0", "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@1.0.0" }, { "url": "http://public2.vulnerablecode.io/api/packages/253398?format=api", "purl": "pkg:nuget/Sustainsys.Saml2@1.0.1", "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@1.0.1" }, { "url": "http://public2.vulnerablecode.io/api/packages/67058?format=api", "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=api", "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=api", "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=api", "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=api", "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" }, { "url": "http://public2.vulnerablecode.io/api/packages/76965?format=api", "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" }, { "url": "http://public2.vulnerablecode.io/api/packages/253400?format=api", "purl": "pkg:nuget/Sustainsys.Saml2@2.6.0", "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@2.6.0" } ], "references": [ { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2020-5268", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.00295", "scoring_system": "epss", "scoring_elements": "0.53151", "published_at": "2026-06-05T12:55:00Z" }, { "value": "0.00295", "scoring_system": "epss", "scoring_elements": "0.53114", "published_at": "2026-06-08T12:55:00Z" }, { "value": "0.00295", "scoring_system": "epss", "scoring_elements": "0.5314", "published_at": "2026-06-07T12:55:00Z" }, { "value": "0.00295", "scoring_system": "epss", "scoring_elements": "0.53159", "published_at": "2026-06-06T12:55:00Z" }, { "value": "0.00295", "scoring_system": "epss", "scoring_elements": "0.53089", "published_at": "2026-06-04T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2020-5268" }, { "reference_url": "https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241", "reference_id": "", "reference_type": "", "scores": [ { "value": "6.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N" }, { "value": "MODERATE", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241" }, { "reference_url": "https://github.com/Sustainsys/Saml2/issues/712", "reference_id": "", "reference_type": "", "scores": [ { "value": "6.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N" }, { "value": "MODERATE", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/Sustainsys/Saml2/issues/712" }, { "reference_url": "https://www.nuget.org/packages/Sustainsys.Saml2", "reference_id": "", "reference_type": "", "scores": [ { "value": "6.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N" }, { "value": "MODERATE", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://www.nuget.org/packages/Sustainsys.Saml2" }, { "reference_url": "https://www.nuget.org/packages/Sustainsys.Saml2/", "reference_id": "", "reference_type": "", "scores": [], "url": "https://www.nuget.org/packages/Sustainsys.Saml2/" }, { "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2020-5268", "reference_id": "CVE-2020-5268", "reference_type": "", "scores": [ { "value": "6.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N" }, { "value": "MODERATE", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-5268" }, { "reference_url": "https://github.com/advisories/GHSA-9475-xg6m-j7pw", "reference_id": "GHSA-9475-xg6m-j7pw", "reference_type": "", "scores": [ { "value": "MODERATE", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" } ], "url": "https://github.com/advisories/GHSA-9475-xg6m-j7pw" }, { "reference_url": "https://github.com/Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pw", "reference_id": "GHSA-9475-xg6m-j7pw", "reference_type": "", "scores": [ { "value": "6.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N" }, { "value": "MODERATE", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" }, { "value": "MODERATE", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pw" } ], "weaknesses": [ { "cwe_id": 1035, "name": "OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities", "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2017." }, { "cwe_id": 287, "name": "Improper Authentication", "description": "When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct." }, { "cwe_id": 937, "name": "OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities", "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2013." }, { "cwe_id": 303, "name": "Incorrect Implementation of Authentication Algorithm", "description": "The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect." } ], "exploits": [], "severity_range_score": "4.0 - 6.9", "exploitability": "0.5", "weighted_severity": "6.2", "risk_score": 3.1, "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-caea-y5bm-zked" }